{"title":"500-Series","description":"","products":[{"product_id":"500-51x-panel","title":"500-Series Aluminum Blanking Panel","description":"\u003cp\u003eBeautiful, blank front panels for your empty 500-series slots. \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBlack, anodized aluminum\u003c\/li\u003e\n\u003cli\u003e6063 architectural aluminum\u003c\/li\u003e\n\u003cli\u003eConforms exactly to 500-series and 51x Alliance front panel dimensions\u003c\/li\u003e\n\u003cli\u003eIncludes standard, countersunk mounting holes\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIt's like, how much more black could this be? And the answer is none. None more black.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDimensions:\u003c\/span\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e1.49\" wide\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e1.54\" high\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e0.125\" thick\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e\n\u003ch5\u003eResources\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/diyre-500-blanking-panel-dimensions.pdf?v=1707503269\" data-mce-href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/diyre-500-blanking-panel-dimensions.pdf?v=1707503269\"\u003e500-Series Aluminum Blanking Panel drawing (PDF)\u003c\/a\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"DIYRE","offers":[{"title":"Default Title","offer_id":12276523076,"sku":"HW-C029","price":7.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/products\/Blank_Panel.jpg?v=1486505610"},{"product_id":"cp5-mic-preamp-with-colour","title":"CP5 Colour Mic Preamp","description":"\u003cp\u003eThe CP5 is the first microphone preamp to feature Colour. On its own, the CP5 is a reference-quality, 500-series mic preamp with copious amounts of clean gain. With Colour, the CP5 is the most tonally versatile preamp in the world.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eWorld Class Preamp. \u003c\/b\u003eThe CP5 is a transparent, low-noise preamp that performs as good or better than preamps 5x the price (seriously, check out the SPECS tab above). The preamp's signal path features only best-in-class components, including WIMA capacitors and THAT Corp. ICs. Preamp gain and Colour are adjustable via stepped controls for easy recall and stereo operation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAdd Some Colour.\u003c\/strong\u003e Plug any \u003ca href=\"http:\/\/www.diyrecordingequipment.com\/collections\/colour-modules\"\u003eColour module\u003c\/a\u003e into the CP5 to add some character to your preamp. Dial in the exact amount of Colour you want with the stepped Colour control. Switch between tone and transparency with the Colour bypass switch. The CP5's preamp works with or without a Colour installed.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eBeginner Friendly.\u003c\/b\u003e Like all our kits, the CP5 comes with every part required and step-by-step picture instructions.\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cimg style=\"float: none;\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/CP5-banner2_large.png?17542782808239043878\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch4\u003eFeatures\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eFully compatible with the 500-series format\u003c\/li\u003e\n\u003cli\u003eStepped controls (21 positions) for easy recall and stereo operation\u003c\/li\u003e\n\u003cli\u003eAnodized black aluminum knobs and front panel\u003c\/li\u003e\n\u003cli\u003ePhantom power, polarity, -20dB pad, and Colour switches\u003c\/li\u003e\n\u003cli\u003eMic preamp gain adjustable from +20-66dB\u003c\/li\u003e\n\u003cli\u003eUltra-transparent, low-noise preamp\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eNo electrolytic capacitors or transformers in the signal path\u003c\/li\u003e\n\u003cli\u003eWIMA film coupling capacitors\u003c\/li\u003e\n\u003cli\u003eBased on the best-in-class THAT Corp. 1512 preamplifier IC\u003c\/li\u003e\n\u003cli\u003eElectronically balanced inputs and outputs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003eSingle Colour socket\u003c\/li\u003e\n\u003cli\u003eColour control adjusts amount of Colour without changing overall gain\u003c\/li\u003e\n\u003cli\u003eKit includes every component required to build the CP5\u003c\/li\u003e\n\u003cli\u003eStep-by-step manual and guaranteed support \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe CP5 circuit and PCB layout were designed by Peter and \u003cspan data-mce-fragment=\"1\"\u003eRobert-Eric Gaskell of \u003ca href=\"http:\/\/www.gklaudio.com\/\"\u003eGKL Audio\u003c\/a\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv class=\"pros\"\u003e\n\u003ch2\u003eWhat the Pros are Saying\u003c\/h2\u003e\n\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/jack-mason.jpg?v=1618838066\"\u003e\n\u003cdiv class=\"pro-review\"\u003e\n\u003cp class=\"pro-quote\"\u003e\"Undoubtedly the most flexible and variable mic pre out there. And if you know how to solder it’s at an unparalleled price point for its quality. Pro tip... it pairs extraordinarily well with DIYRE passive summing mixers for even more tonal flexibility on your mix bus or group buses.\"\u003c\/p\u003e\n\u003cp class=\"pro-cite\"\u003e\u003cem\u003e-Jack Mason\u003c\/em\u003e\u003cbr\u003eJ.Cole, Joe P, Spotify Singles\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/sonicscoop.jpg?v=1576009646\"\u003e\n\u003cdiv class=\"pro-review\"\u003e\n\u003cp class=\"pro-quote\"\u003e\"This really is one of the most versatile and useful preamps on the market. If you like getting your hands on a soldering iron, it can be one of the most satisfying to own as well.\"\u003c\/p\u003e\n\u003cp class=\"pro-cite\"\u003e-\u003ca href=\"http:\/\/www.sonicscoop.com\/2016\/01\/12\/new-gear-review-cp5-preamp-kit-from-diy-recording-equipment\/\"\u003eSonic Scoop\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch5\u003eVideo\u003c\/h5\u003e\n\u003cp\u003eDialing in drum sounds with the CP5 and Colours:\u003c\/p\u003e\n\u003cp\u003e\u003ciframe height=\"315\" width=\"560\" src=\"https:\/\/www.youtube.com\/embed\/hqHm9bdsA9g\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003ch5\u003eSpecs\u003c\/h5\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr class=\"spec-label\"\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCP5 ($150)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/preamp-name-blurred.png?v=1639002955\" style=\"position: relative; top: 9px;\"\u003e($745)\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eInput Impedance\u003c\/td\u003e\n\u003ctd\u003e2.9k Ohms\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eGain\u003c\/td\u003e\n\u003ctd\u003e20-66dB, unity gain with pad engaged\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003ePad Attenuation\u003c\/td\u003e\n\u003ctd\u003e20dB\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eTHD+N @ 20dB gain*\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"best-spec\"\u003e0.00040%\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.00085%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eTHD+N @ 40dB gain*\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"best-spec\"\u003e0.0007%\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.0010%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eTHD+N @ 60dB gain*\u003c\/td\u003e\n\u003ctd\u003e0.005%\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.005%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eNoise (EIN), 66dB gain, 150\u003cspan data-mce-fragment=\"1\"\u003eΩ source\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd\u003e-128dB\u003c\/td\u003e\n\u003ctd\u003e-128dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eCMRR @ 10kHz, 60dB gain\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"best-spec\"\u003e80dB\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e65dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e*+20dBu output, 1kHz, 20-20kHz bandwidth\u003c\/p\u003e\n\u003ch5\u003eResources\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/www.diyrecordingequipment.com\/pages\/cp5-assembly-guide\"\u003eCP5 Assembly Guide\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/maps.diy.re\/cp5\/\"\u003eCP5 Interactive Build Map\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/CP5_1.1_Schematic.pdf?490\"\u003eCP5 Schematic\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/MAN-008_CP5_Manual_Inside_1.0.pdf?v=1693508856\"\u003eCP5 Manual\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/manuals.diy.re\/assets\/recall\/cp5-vertical.pdf\" target=\"_blank\"\u003eCP5 Recall Sheet (Vertical)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/manuals.diy.re\/assets\/recall\/cp5-horizontal.pdf\" target=\"_blank\"\u003eCP5 Recall Sheet (Horizontal)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"DIYRE","offers":[{"title":"Kit","offer_id":4729953028,"sku":"KIT-037.04","price":200.0,"currency_code":"USD","in_stock":true},{"title":"Assembled","offer_id":47587908303,"sku":"","price":300.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/products\/CP5_Three_Quarter.jpg?v=1447354068"},{"product_id":"colour-500-series-palette-mkii-kit","title":"Colour 500-Series Palette mkII","description":"\u003cp style=\"font-size: 1.2em;\"\u003eAdd three stages of real analog color to your setup in a single 500-series slot.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRevamped Controls.\u003c\/strong\u003e Dial in exactly the signal path you want with individual drive\/trim knobs and bypass switches for each Colour. 21-position stepped controls make stereo matching and recall easy.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStill Radically Affordable. \u003c\/strong\u003eDespite featuring new controls, an upgraded signal path, and aluminum knobs (formerly a premium upgrade), the Palette mkII still comes in at an unbelievable price point.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEven DIY Friendlier.\u003c\/strong\u003e The Palette mkII is a painstakingly thought out and documented kit. Over the last few years, we've seen seen every possible snag a DIY project can hit, and built every way we can think of to prevent those snags into this kit.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cimg alt=\"\" src=\"\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/Palette-mkII-controls_large.png?3504073589264617746\" style=\"float: none;\"\u003e\u003c\/p\u003e\n\u003ch3\u003eFull Features List\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e3 Colour sockets. Colour modules are sold separately. Browse our ever-broadening \u003ca href=\"http:\/\/store.diyrecordingequipment.com\/colour\/\"\u003eColour spectrum\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eIndividual knobs and switches for each Colour\u003c\/li\u003e\n\u003cli\u003eMaster output trim\/boost control\u003c\/li\u003e\n\u003cli\u003e21-position detented potentiometers for stereo matching and recall\u003c\/li\u003e\n\u003cli\u003eAnodized aluminum knobs (previously an upgrade, now stock!)\u003c\/li\u003e\n\u003cli\u003eCustomize your signal chain by swapping Colours' positions\u003c\/li\u003e\n\u003cli\u003eUltra-transparent signal path when Colours are bypassed\u003c\/li\u003e\n\u003cli\u003eElectronically balanced, line-level inputs and outputs\u003c\/li\u003e\n\u003cli\u003eRGB indicator LEDs automatically light up to the hue of the Colours installed\u003c\/li\u003e\n\u003cli\u003eCompatible with the 500-series format\u003c\/li\u003e\n\u003cli\u003eKit includes every part need to complete the Palette\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"pros\"\u003e\n\u003ch2\u003eWhat the Pros are Saying\u003c\/h2\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/MT-excellence.png?v=1576005934\"\u003e\n\u003cdiv class=\"pro-review\"\u003e\n\u003cp class=\"pro-quote\"\u003e\"The Colour system is a fascinating example of what can be done with analogue electronics, and produces some great textures. If you have a 500-series with space for another module or two, this is a no-brainer.\"\u003c\/p\u003e\n\u003cp class=\"pro-cite\"\u003e\u003cem\u003e-Mike Hillier\u003c\/em\u003e\u003cbr\u003e\u003ca href=\"https:\/\/www.musictech.net\/reviews\/diy-recording-equipment-colour-review\/\"\u003eMusicTech.net\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/107_cover.png?v=1576006712\"\u003e\n\u003cdiv class=\"pro-review\"\u003e\n\u003cp class=\"pro-quote\"\u003e\"I can't say enough good things about Colour. This product embodies everything Tape Op is about. It's rooted in DIY; it sounds good; and it's inexpensive, novel, fun, and wide open for experimentation. Right on.\"\u003c\/p\u003e\n\u003cp class=\"pro-cite\"\u003e\u003cem\u003e-Scott Evans\u003c\/em\u003e\u003cbr\u003e\u003ca href=\"https:\/\/tapeop.com\/reviews\/gear\/107\/colour-500-series-analog-saturation-platform\/\"\u003eTapeOp Magazine #107\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/sos.jpg?v=1576008315\"\u003e\n\u003cdiv class=\"pro-review\"\u003e\n\u003cp class=\"pro-quote\"\u003e\"...the whole concept and execution works brilliantly: DIYRE’s Colour platform is a great way to add a little analogue character to your setup, or to dip those first tentative toes into the world of DIY.\"\u003c\/p\u003e\n\u003cp class=\"pro-cite\"\u003e\u003cem\u003e-Matt Houghton\u003c\/em\u003e\u003cbr\u003e\u003ca href=\"https:\/\/www.soundonsound.com\/reviews\/diyre-colour\"\u003eSound on Sound Magazine\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch5\u003eTechnical \u003c\/h5\u003e\n\u003ch4\u003eSignal Path\u003c\/h4\u003e\n\u003cp\u003eThe balanced, line-level input signal is received via a THAT Corp. 1256 integrated circuit. From there, the signal passes through each Colour stage in series.\u003c\/p\u003e\n\u003cp\u003eEach Colour stage includes a bypass switch and combined drive\/trim control. The drive\/trim control is a dual potentiometer that controls both a drive amplifier before the Colour and corresponding attenuator after the Colour. The result is that the Colour's intensity increases\/decreases while the net gain remains the same.\u003c\/p\u003e\n\u003cp\u003eThe Colour stages are followed by a master output trim\/boost control and bypass switch. Finally, the output signal is balanced via a THAT Corp. 1646 line driver IC.\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cimg alt=\"\" src=\"\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/Colour_Palette_Block_Diagram_Collapsed_grande.png?4480154476017406545\" style=\"float: none;\"\u003e\u003c\/p\u003e\n\u003ch4 style=\"text-align: left;\"\u003eSpecifications\u003c\/h4\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eInput Impedance\u003c\/td\u003e\n\u003ctd\u003e24kΩ \u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eOutput Impedance\u003c\/td\u003e\n\u003ctd\u003e50Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eColour Controls Gain Range\u003c\/td\u003e\n\u003ctd\u003e0-18dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eOutput Control Gain Range\u003c\/td\u003e\n\u003ctd\u003e+\/-6dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eMax Input Level\u003c\/td\u003e\n\u003ctd\u003e27.5dBu\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003ePower Supply Voltage\u003c\/td\u003e\n\u003ctd\u003e+\/-16VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003ePower Supply Current\u003c\/td\u003e\n\u003ctd\u003e140mA max (with three Colours installed)\u003cbr\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eChassis Requirements\u003c\/td\u003e\n\u003ctd\u003eCompatible with any 500-series rack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eNominal Operating Level\u003c\/td\u003e\n\u003ctd\u003e+4dBu\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch5\u003e\u003cstrong\u003eResources\u003c\/strong\u003e\u003c\/h5\u003e\n\u003cul\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/www.diyrecordingequipment.com\/colour-manual\/\"\u003eColour Knowledge Base\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.diyrecordingequipment.com\/pages\/colour-palette-assembly-guide\"\u003eAssembly Guide\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/Colour_Palette_mkII_Rev_E_1.0.pdf?v=1586792843\"\u003eSchematic (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/www.diyrecordingequipment.com\/pages\/getting-started\" title=\"Getting Started with DIY\"\u003eGetting Started With DIY\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/maps.diy.re\/cp\/#step0\" target=\"_blank\"\u003eInteractive Build Map\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e","brand":"DIYRE","offers":[{"title":"Kit","offer_id":14654064004,"sku":"KIT-011.09","price":200.0,"currency_code":"USD","in_stock":true},{"title":"Assembled","offer_id":48079583695,"sku":"","price":300.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/products\/Colour_Palette_Mk_II_Three_Quarter.jpg?v=1455213609"},{"product_id":"eqp5-passive-eq-kit","title":"EQP5 Passive Equalizer","description":"\u003cp\u003e\u003cspan\u003eThe EQP5 is a premium tone-shaping EQ based on the prized Pultec EQP filter circuitry. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe World's Most Musical Filters. \u003c\/strong\u003eThe EQP5 employs the passive filter circuitry made famous by Pultec's legendary EQP series of equalizers. Decades after their introduction, these EQ's remain coveted for their uniquely musical and natural behavior.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eModern Clarity or Vintage Tone. \u003c\/strong\u003eChoose between a clean and modern or vintage and colored output stage. If both outputs are installed, you can switch between them with a solderless jumper on the board.\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/products\/EQP5_Side_medium.jpg?v=1485986577\" style=\"float: none;\"\u003e\u003c\/p\u003e\n\u003cp style=\"padding-left: 30px;\"\u003eThe \u003cstrong\u003eModern\u003c\/strong\u003e (stock) output is a clean, robust, balanced output for excellent noise performance. Choose this output to use the EQP5 for transparent, natural tone-shaping.\u003c\/p\u003e\n\u003cp style=\"padding-left: 30px; text-align: center;\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/products\/EQP5_Vintage_Side_medium.jpg?v=1486485051\" style=\"float: none;\"\u003e\u003c\/p\u003e\n\u003cp style=\"padding-left: 30px;\"\u003eThe optional \u003cstrong\u003eVintage\u003c\/strong\u003e output employs an API-style DOA (discrete opamp) and custom transformer for a livelier dynamic character. The vintage output gives signals a more visceral, forward feeling that helps them translate clearly in a mix while requiring less level to do so. The solid-state Pultecs, the sound of which many engineers claim to be sweeter than that of the earlier tube units, use the same DOA\/transformer output scheme.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDesigned for DIY. \u003c\/strong\u003eThe EQP5 was designed from the ground-up to be a satisfying DIY project. Our photo manual will guide you through every step of the assembly. And the circuit board contains extra capacitor and inductor footprints for customizing the frequency bands.\u003c\/p\u003e\n\u003cp\u003e\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/j2FchTDtLJY\" width=\"560\" height=\"315\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003ch4\u003eFeatures\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eStepped controls (21 positions) for easy recall and stereo operation\u003c\/li\u003e\n\u003cli\u003eAnodized aluminum knobs and front panel\u003c\/li\u003e\n\u003cli\u003ePushbutton frequency-select switches for each band\u003c\/li\u003e\n\u003cli\u003eQ-adjustment via PCB trimpot\u003c\/li\u003e\n\u003cli\u003eOptional vintage DOA\/transformer output section\u003c\/li\u003e\n\u003cli\u003eKit includes every component required to build the EQP5\u003c\/li\u003e\n\u003cli\u003eStep-by-step manual and guaranteed support \u003c\/li\u003e\n\u003cli\u003eFully compatible with the 500-series format\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eStill have questions? Check out the FAQ and Audio tabs above for more info and samples.\u003c\/p\u003e\n\u003cp\u003eThe EQP5 is the first product collaboration between DIYRE and JC-diy. JC-diy is the brand of Joel Cameron, founder of Rascal Audio. To learn more about how the EQP5 came to be, check out Joel's series of \u003ca href=\"http:\/\/www.diyrecordingequipment.com\/blogs\/news\/114110532-designing-a-500-series-pultec-style-eq\"\u003eEQP5 design blog  posts\u003c\/a\u003e.\u003c\/p\u003e\n\u003cdiv class=\"pros\"\u003e\n\u003ch2\u003eWhat the Pros are Saying\u003c\/h2\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/robschnapf_160x160.jpg?v=1575928965\" alt=\"\"\u003e\n\u003cdiv class=\"pro-review\"\u003e\n\u003cp class=\"pro-quote\"\u003e\"I been using the EQP5 a lot lately and really dig how smooth it is. There isn't really a bad place for it. Any place I've used it, it helps. It doesn’t feel all phase shifty like some EQs do when you crank on them. I have to check that it’s in because it’s so natural sounding. It’s definitely in. Natural as f*ck. The EQP5 is a legit tool regardless of cost. I use this along side my Lang and Pultecs.\"\u003c\/p\u003e\n\u003cp class=\"pro-cite\"\u003e\u003cem\u003e-Rob Schnapf\u003c\/em\u003e\u003cbr\u003eElliott Smith, Guided by Voices, The Vines, Saves the Day\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/sonicscoop.jpg?v=1576009646\" alt=\"\"\u003e\n\u003cdiv class=\"pro-review\"\u003e\n\u003cp class=\"pro-quote\"\u003e\"The EQP5 sounds great, and is sneakily a very flexible tool. A passive shelving EQ is a great addition to any engineer’s arsenal, and the EQP5 is a no-brainer for DIY experts and newcomers alike.\"\u003c\/p\u003e\n\u003cp class=\"pro-cite\"\u003e-\u003ca href=\"hhttps:\/\/sonicscoop.com\/2017\/07\/12\/new-gear-review-eqp5-500-series-eq-diyre\/\"\u003eSonic Scoop\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch5\u003eAudio\u003c\/h5\u003e\n\u003cp\u003eAll of the samples below are processed using only the EQP5. Each sample switches between the dry (no EQP5) and processed tracks every two bars (eight counts).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDrums.\u003c\/strong\u003e These samples demonstrate the EQP5 on a stereo drum mix:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/EQP5_-_Drums_Dry_vs_Modern.wav?5600497734063236028\"\u003eDrums Dry vs EQP5 Modern\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/EQP5_-_Drums_Dry_vs_Vintage.wav?5600497734063236028\"\u003eDrums Dry vs EQP5 Vintage\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eStem Mix.\u003c\/strong\u003e A set of six stems—lead vocals, background vocals, bass, guitars, drums, and pads\/acoustic guitar—were processed with the EQP5. The sample switches between the raw mix and the mix after stem processing with the EQP5.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/EQP5_-_Stems_Dry_vs_Modern.wav?5600497734063236028\"\u003eStems Dry vs EQP5 Modern\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/EQP5_-_Stems_Dry_vs_Vintage.wav?5600497734063236028\"\u003eStems Dry vs EQP5 Vintage\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eMastering.\u003c\/strong\u003e This sample demonstrates using the EQP5 on the stereo master. The samples switch between the processed stem mix with no mastering, and the same stem mixes with EQP5 processing on the stereo bus. Notice how naturally the EQP5 widens the stereo image, brings the drums forward, and helps the vocals find the perfect place to sit in the mix.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/EQP5_-_Stems_Modern_vs_Master_Modern.wav?5600497734063236028\"\u003eMix Dry vs EQP5 Modern\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/EQP5_-_Stems_Vintage_vs_Master_Vintage.wav?5600497734063236028\"\u003eMix Dry vs EQP5 Vintage\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eModern vs Vintage.\u003c\/strong\u003e Finally, the samples below demonstrate the difference between the Modern and Vintage outputs. Notice how the Vintage output brings the snare slightly forward in the mix, and adds a more \"finished\" quality to mix. For these samples, we used the RED-25 DOA.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/EQP5_-_Drums_Modern_vs_Vintage.wav?5600497734063236028\"\u003eDrums Modern vs Vintage\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/EQP5_-_Stems_Modern_vs_Vintage.wav?5600497734063236028\"\u003eStems Modern vs Vintage\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/EQP5_-_Master_Modern_vs_Master_Vintage.wav?5600497734063236028\"\u003eMastering Modern vs Vintage\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe track in the samples is \"Walls\" (early reference mix), by Robinson, \u003ca href=\"https:\/\/robinsonmusic.bandcamp.com\/\" target=\"_blank\"\u003ehttps:\/\/robinsonmusic.bandcamp.com\u003c\/a\u003e\u003cbr\u003e\u003cspan\u003eProduced by James Childs,\u003ca href=\"http:\/\/www.jameschildsmusic.com\/\" target=\"_blank\"\u003ehttp:\/\/www.jameschildsmusic.com\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch5\u003eFAQ\u003c\/h5\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eWhich Pultec model(s) is the EQP5 based on?\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eThe filter used in the EQP5 is derived from the filter design from Pultec’s coveted EQP-series of equalizers. As such it features low frequency boost and cut (shelving), a high frequency boost (peaking) and a high frequency cut (shelving). The stock frequencies are taken from the EQP-1A3 and are exceptional for general sweetening of individual signals and mixed program material. Unlike the Pultec model, however, the two LF bands (boost and cut, respectively) have separate frequency selections (instead of a single switch that selects both boost and cut), so you can cut at one frequency and boost at another, which cannot be done with original Pultecs or their clones.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eWhat's the difference between the Modern and Vintage outputs?\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eThe stock, Modern output design uses two IC (integrated circuit) opamp stages: one to make up level lost in the filter circuit, and the other as an inverting stage to provide a differential (balanced) output. This design provides an overall neutral character to the EQP5 that allows users to sweeten the audio spectrum while leaving the signal otherwise untouched.\u003c\/p\u003e\n\u003cp\u003eThe optional, Vintage output uses a discrete opamp (any DOA fitting the API 2520 footprint and pinout can be used) and a custom output transformer (wired 1:2) to give the EQP5 a more visceral, dynamic character that gives signals additional authority and helps them translate clearly in the mix while requiring less volume and processing to do so. The solid-state Pultec EQPs, the sound of which many engineers claim to be sweeter than that of the earlier tube units, use this same DOA\/transformer output scheme.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eCan I modify the frequencies?\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eAbsolutely you can! The documentation included with each kit includes optional component values for many additional frequency choices for each band, so the more adventurous DIYer can customize their EQP5’s to their hearts content.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eWhy are there separate knobs for boost and cut?\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eBecause this is the approach used on the original Pultecs, upon which the EQP5 is based. Accordingly, each boost or cut function features its own knob. The full clockwise throw of these knobs is dedicated to either boosting or cutting its relative frequency. Because the full throw of these knobs is used only for boosting or cutting the resolution of the knobs is quite precise and makes the EQP5 perfect for refined processing of program material, such as 2-mix processing and mastering.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eWhere are the tubes?!\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eNo tubes in the EQP5, sorry. The optional output shares topology with the later, solid state Pultecs, but we didn’t want the complexity of build (or the lethal voltages!) of quality vacuum tube circuits. Plus many people prefer the character of the solid state Pultecs over the earlier units with the differential vacuum tube stage.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eCan I adjust the bandwidth on the HF boost band like I can on an original Pultec?\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eYes, you can! The EQP5 provides a single-turn trimpot on the main PCB (printed circuit board) that allows adjustment for the HF+ bandwidth. Note that the setting of the Q trimpot directly affects the total available boost of the HF+ band. To understand why this is so, a brief explanation is warranted:\u003c\/p\u003e\n\u003cp\u003eThe EQP5’s filter is entirely passive and produces an insertion loss across the entire frequency spectrum when controls are set flat. When one implements a boost, the filter is actually affecting a negative or reverse cut (which reduces the amount of cut across the relevant frequency range, allowing more of those frequencies through–a perceived ‘boost’). Being passive, the total amount of energy affected by the HF+ filter is fixed.  When all of this energy is focused on a narrower set of frequencies via a narrow Q setting, the resulting total boost range is greater than when that energy is spread out among a wider range of frequencies (as it is with a broader Q setting). As a result the same position of the front panel’s HF+ knob will result in higher or lower absolute boost, depending on the setting of the Q trimpot.\u003c\/p\u003e\n\u003cp\u003eGiven that wider Q settings yield more natural sounding results (for a broader range of applications), we recommend setting the trimpot somewhere between 12 and 2 o’clock. But feel free, of course, to play with this control to see what settings work best for your applications. The PCB provides test points for measurement of this trimpot, so settings can be logged for channel matching and\/or later recall.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eWhy not put the bandwidth control on the front panel?\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eFront panel real estate on a 500-series module is limited, so there is often much weeping and gnashing of teeth when determining what controls will make it onto the front of the unit. Being able to provide all the front panel controls of the EQP5 plus a bandwidth knob would have made the build more complex and considerably more expensive. Besides, not all Pultec models included this control. For example, the HF+ band of Pultec’s EQH-2 (a close cousin to the EQPs) had a fixed Q with no user adjustment available. In our experience, of all the controls on an EQP-style program EQ the bandwidth seems to get the least use, so we decided to move it to the PCB, so users can still make adjustments as desired.\u003c\/p\u003e\n\u003cp\u003eThe PCB provides test points for measurement of the Q trimpot, so settings can be logged for channel matching and\/or later recall.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003e30Hz? Is that really a useful frequency?\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eAbsolutely! The 30Hz position is one of the original four LF choices on the Pultec EQPs, and one of our favorites to boot (hence its inclusion on the EQP5)! One could certainly argue that 30Hz isn’t the most musically useful frequency for an EQ, but this isn’t your typical EQ. The slope of these LF filters are so broad that they affect frequencies above 1kHz (boost) and up past 3kHz (cut), making these filters extremely musical (and broadly applicable) regardless of their labels. Check out the audio samples to hear these filters in action.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eDoes the EQP5 sound like an original Pultec?\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eYes and no. Helpful? Let me explain.\u003c\/p\u003e\n\u003cp\u003eThe EQP5’s filter design and available frequencies are taken directly from Pultec’s classic EQP-1A3. As such it shares the same ability to sweeten the frequency response of all kinds of signals as the classic Pultec. Where the EQP5 differs, sonically, is in the signal path.\u003c\/p\u003e\n\u003cp\u003eThe stock signal path of the EQP5 is an all-IC, transformerless design. As such it delivers a purer signal which is more faithful to the signal being processed compared to the more colored signal path of vintage units. If you want more vintage color then opting for the discrete opamp\/transformer-balanced output is the way to go with your EQP5. This arrangement, used in the later, solid-state Pultecs, gives your signals a lively, dynamic, more opulent characteristic that is as much felt as it is heard. Check out the examples of this output in action, even without the filter engaged to see what we mean.\u003c\/p\u003e\n\u003ch5\u003eResources\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.diyrecordingequipment.com\/pages\/eqp5-assembly-guide\"\u003eEQP5 Assembly Guide\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.diyrecordingequipment.com\/pages\/eqp5-vintage-output-assembly-guide\"\u003eEQP5 Vintage Output Assembly Guide\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/maps.diy.re\/eqp5\/#step0\" target=\"_blank\"\u003eInteractive Build Map\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.diyrecordingequipment.com\/pages\/eqp5-equalizer-frequency-mods\"\u003eEQP5 Optional Frequency Mods\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/manuals.diy.re\/assets\/recall\/eqp5-vertical.pdf\" target=\"_blank\"\u003eEQP5 Recall Sheet (Vertical)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/manuals.diy.re\/assets\/recall\/eqp5-horizontal.pdf\" target=\"_blank\"\u003eEQP5 Recall Sheet (Horizontal)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe sweeps below demonstrate every band of the EQP5, as well as using the lower boost\/cut bands simultaneously. The different colored lines represent different cut\/boost settings. The EQP5 was set with a medium bandwidth.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/20k-Cut.png?3712713431969114173\" alt=\"20k Cut\"\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/10k-Cut.png?3712713431969114173\" alt=\"10k Cut\"\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/16k-Boost.png?3712713431969114173\" alt=\"16k Boost\"\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/10k-Boost.png?3712713431969114173\" alt=\"10k Boost\"\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/60Hz-Cut.png?3712713431969114173\" alt=\"60Hz Cut\"\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/30Hz-Cut.png?3712713431969114173\" alt=\"30Hz Cut\"\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/60Hz-Boost.png?3712713431969114173\" alt=\"60Hz Boost\"\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/30Hz-Boost.png?3712713431969114173\" alt=\"30Hz Boost\"\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/60Hz-Boost-60Hz-Cut.png?3712713431969114173\" alt=\"60Hz Boost, 60Hz Cut (Simultaneous)\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/30Hz-Boost-30Hz-Cut.png?3712713431969114173\" alt=\"30Hz Boost, 30Hz Cut (Simultaneous)\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/60Hz-Boost-30Hz-Cut.png?3712713431969114173\" alt=\"60Hz Boost, 30 Hz Cut (Simultaneous)\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/30Hz-Boost-60Hz-Cut.png?3712713431969114173\" alt=\"30Hz Boost, 60Hz Cut\"\u003e \u003ciframe src=\"https:\/\/www.youtube.com\/embed\/galV1DaVurY\" width=\"560\" height=\"315\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e","brand":"DIYRE","offers":[{"title":"Kit \/ Modern \/ None","offer_id":33316744527,"sku":"KIT-075.02","price":300.0,"currency_code":"USD","in_stock":true},{"title":"Kit \/ Vintage and Modern \/ None","offer_id":5707957534747,"sku":"","price":350.0,"currency_code":"USD","in_stock":true},{"title":"Kit \/ Vintage and Modern \/ RED-25","offer_id":5707880103963,"sku":"","price":375.0,"currency_code":"USD","in_stock":true},{"title":"Assembled \/ Modern \/ None","offer_id":42089303048437,"sku":"","price":500.0,"currency_code":"USD","in_stock":true},{"title":"Assembled \/ Vintage and Modern \/ RED-25","offer_id":42089304228085,"sku":"","price":600.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/products\/EQP5_Three_Quarter.jpg?v=1618611405"},{"product_id":"pr502-2-slot-500-series-chassis","title":"PR502 2-Slot 500-Series Chassis","description":"\u003cp\u003eThe PR502 is a 2-channel, high-current, 500-series chassis in a desktop or 19\" rack-mount format. The assembly process is fairly simple, and does not require dealing with wall power.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2 style=\"text-align: center;\"\u003eRugged and refined\u003c\/h2\u003e\n\u003cp\u003e\u003cimg src=\"\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/PR502_Corner-smaller_large.jpg?v=1506361723\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003eThe PR502's minimalist, all-black chassis is made from anodized aluminum and powder-coated steel. The compact case fits into any desktop setup, while the \u003ca href=\"https:\/\/www.diyrecordingequipment.com\/products\/pr502-rack-ears\"\u003eoptional rack ears\u003c\/a\u003e make the PR502 compatible with standard 19\" racks.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2 style=\"text-align: center;\"\u003eHigh-current, low-noise\u003c\/h2\u003e\n\u003cp\u003e\u003cimg src=\"\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/PR502_Power_Supply-cropped_grande.jpg?v=1506454182\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003eOur custom, universal power supply provides up to 250mA of clean current per channel—almost double the 500-series spec—and can power up to four PR502 racks (eight modules). Additional filtering and regulating in the chassis ensures that the power for your modules is stable and dead quiet.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2 style=\"text-align: center;\"\u003eSimplicity is a feature\u003c\/h2\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/PR502_Back_Tight_Crop_v2.jpg?v=1687990960\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003eWhile the PR502 is designed with an emphasis on simplicity, it is a full-featured 500 rack.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTHRU jack for powering additional racks\u003c\/li\u003e\n\u003cli\u003eLED power indicators for +\/-16 and +48v\u003c\/li\u003e\n\u003cli\u003eNeutrik XLR audio jacks\u003c\/li\u003e\n\u003cli\u003eFEED feature turns your PR502 into a channel strip by patching channel 1 into channel 2 without a cable\u003c\/li\u003e\n\u003cli\u003eCompressor link\u003c\/li\u003e\n\u003cli\u003e11\" x 8\" x 1.7\" without rack ears\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2 style=\"text-align: center;\"\u003eBeginner friendly\u003c\/h2\u003e\n\u003cp\u003e\u003cimg src=\"\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/PR502-assembly_grande.jpg?v=1506458058\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003eAssembling the PR502 is safe and easy, thanks to the external power supply and our step-by-step instructions.\u003c\/p\u003e\n\u003cp\u003eEstimated build time: 1 hour\u003c\/p\u003e\n\u003chr\u003e\n\u003ch5\u003eResources\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/manuals.diy.re\/pr502\"\u003ePR502 Assembly Guide\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.diyrecordingequipment.com\/products\/pr502-rack-ears\"\u003ePR502 Rack Ears\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/PR502_2.0_Schematic.pdf?v=1618407777\"\u003ePR502 Schematic\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUnfortunately, the following brands' modules are wider than the 500-series specification and do not fit in the PR502:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRupert Neve Designs\u003c\/li\u003e\n\u003cli\u003eAudioScape\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"DIYRE","offers":[{"title":"Kit \/ Rack Ears \/ External PSU","offer_id":45796694294773,"sku":"","price":240.0,"currency_code":"USD","in_stock":true},{"title":"Kit \/ Rack Ears \/ THRU Cable","offer_id":45796694327541,"sku":"","price":190.0,"currency_code":"USD","in_stock":true},{"title":"Kit \/ None \/ External PSU","offer_id":45796694360309,"sku":"","price":225.0,"currency_code":"USD","in_stock":true},{"title":"Kit \/ None \/ THRU Cable","offer_id":45796694393077,"sku":"","price":175.0,"currency_code":"USD","in_stock":true},{"title":"Assembled \/ Rack Ears \/ External PSU","offer_id":45796694425845,"sku":"","price":315.0,"currency_code":"USD","in_stock":true},{"title":"Assembled \/ Rack Ears \/ THRU Cable","offer_id":45796694458613,"sku":"","price":265.0,"currency_code":"USD","in_stock":true},{"title":"Assembled \/ None \/ External PSU","offer_id":45796694491381,"sku":"","price":300.0,"currency_code":"USD","in_stock":true},{"title":"Assembled \/ None \/ THRU Cable","offer_id":45796694524149,"sku":"","price":250.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/products\/PR502_Front.jpg?v=1507065024"},{"product_id":"pr502-rack-ears","title":"PR502 Rack Ears","description":"Mount your \u003ca href=\"https:\/\/www.diyrecordingequipment.com\/products\/pr502-2-slot-500-series-chassis\"\u003ePR502\u003c\/a\u003e in a standard 19\" rack with these sturdy rack ears. Made from powder-coated, 14 gauge steel. Includes two rack ears and mounting screws.","brand":"DIYRE","offers":[{"title":"Default Title","offer_id":45796424286453,"sku":"KIT-081.01","price":15.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/products\/PR502_Rack_Ears_2.jpg?v=1507736740"},{"product_id":"500ext-500-series-extender-kit","title":"500EXT 500 Series Extender Kit","description":"\u003cp\u003eThe 500EXT allows you to test and calibrate your 500-series modules without reaching into your rack. One end plugs into a slot in your rack, while the other provides a socket for any 500-series module.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCompatible with all 500-series modules and racks\u003c\/li\u003e\n\u003cli\u003eTest pads for checking power rails\u003c\/li\u003e\n\u003cli\u003e10\" pre-assembled ribbon extender cable\u003c\/li\u003e\n\u003cli\u003eOnly three parts to solder\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eResources\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.diyrecordingequipment.com\/pages\/500ext-assembly-guide\"\u003e500EXT Assembly Guide\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"DIYRE","offers":[{"title":"Default Title","offer_id":12480078217309,"sku":"KIT-093.01","price":20.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/products\/Extension_Jig.jpg?v=1542212203"},{"product_id":"73p-class-a-mic-preamp","title":"73P Class-A Mic Preamp","description":"\u003cp\u003eThe 73P is an authentic, complete adaptation of the vintage 1073®* mic preamp circuitry to the 500-series format. The 73P is authentic in that it uses only components that are hand-selected to match the original, and there are no changes to any of the preamp circuitry. The 73P is complete in that it adheres to the original, three-stage amplifier design.\u003c\/p\u003e\n\u003cp\u003eThe 73P is an intermediate DIY kit. To successfully build it, you should have some experience identifying basic components such as resistors and capacitors and soldering on circuit boards. We don't recommend the 73P as your first DIY project ever—check out our \u003ca href=\"https:\/\/www.diyrecordingequipment.com\/collections\/for-beginners\"\u003ebeginner kits\u003c\/a\u003e first. Check the Required Tools list below to make sure you have everything you need to build the 73P before ordering.\u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/73p-gain2.jpg?v=1716506125\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003eThe definitive kit\u003c\/h2\u003e\n\u003cp\u003eOur guiding principle in designing the 73P was to get everything right. Every choice, from the use of Carnhill transformers to the hue of the front panel, was carefully considered and tested against the original. The 73P even features a unique power regulator circuit designed to replicate the imperfections of the original console power supply.\u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/73p-1.1-guts.jpg?v=1756997655\"\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003eKnow your tools\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\n\u003c\/h2\u003e\n\u003cp\u003eOur assembly guide makes building the 73P as simple as possible (but no simpler). The 73P is intended for intermediate DIYers who are driven to learn more about how analog audio gear works. The assembly guide is broken down into circuit blocks. Each block features an explanation of how it works and contributes to the sound of the preamp.\u003cbr\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003e\u003ciframe height=\"387\" width=\"942\" src=\"https:\/\/www.youtube.com\/embed\/s3Jp3PXYf1U?si=zs3vD8bAM44q0rr1\" title=\"YouTube video player\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003eFull feature list\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eThree-stage mic preamp based on the 1290 preamp, the same found in the 1073® preamp and EQ\u003c\/li\u003e\n\u003cli\u003eGrayhill 12-position gain switch\u003c\/li\u003e\n\u003cli\u003eLINE mode turns the preamp into a line-level processor for adding warmth and depth in mixing\u003c\/li\u003e\n\u003cli\u003eLO Z switch for switching input impedance between 1.2k (standard) and 300 ohms.\u003c\/li\u003e\n\u003cli\u003eTRIM knob allows for driving the preamp hard without clipping the next device\u003c\/li\u003e\n\u003cli\u003eWIMA and tantalum capacitors in the signal path\u003c\/li\u003e\n\u003cli\u003eCarnhill input and output transformers\u003c\/li\u003e\n\u003cli\u003eFront panel DI input. When an instrument is plugged in the mic\/line input is automatically disabled\u003c\/li\u003e\n\u003cli\u003eOn-board regulator sets the power voltage to +24 like the original\u003c\/li\u003e\n\u003cli\u003eFully compatible with the 500-series format\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eDIY kit\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eComes with every part needed to complete kit\u003c\/li\u003e\n\u003cli\u003eFeatures step-by-step photo instructions, interactive build map, and component sorting sheet\u003c\/li\u003e\n\u003cli\u003ePCB is divided into circuit blocks, with corresponding explanations of each block in the assembly guide\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAs of August 2025 kits are version 1.1. See the \"Design Notes\" tab for a full list of revisions.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eRequired Tools\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eSoldering iron. We recommend an adjustable-temperature station. The smaller, pencil-style ones that plug directly into the wall do not have enough power to create good joints consistently.\u003c\/li\u003e\n\u003cli\u003eSolder. You can use 60\/40 leaded solder or lead-free. We recommend 60\/40 because it is easier and more forgiving to use.\u003c\/li\u003e\n\u003cli\u003eWire cutters. A good pair will be sharp and have a fine point for cutting leads down right at the solder joint. Don't use a set of large cutters meant for household wiring.\u003c\/li\u003e\n\u003cli\u003ePhillips head screwdriver\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.diyrecordingequipment.com\/products\/500ext-500-series-extender-kit\"\u003e500EXT 500-Series Cable Extender\u003c\/a\u003e or a horizontal 500-series rack with a removable lid. Testing and calibrating the 73P requires accessing the circuit board while it is plugged into the rack. This is almost impossible to do in a vertical 500-series rack without an extender like the 500EXT.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e*The 73P is not designed or manufactured by AMS Neve Limited, owner of the trademarks Neve®, 1073®, and Marinair®.\u003c\/p\u003e\n\u003ch5\u003eDesign Notes\u003c\/h5\u003e\n\u003ch3\u003eDesigning the 73P\u003c\/h3\u003e\n\u003ch4\u003ePicking a Circuit\u003c\/h4\u003e\n\u003cp\u003eOur intention with this project was to recreate the mic preamp from the 1073 preamp\/EQ module as authentically as possible. (Neve® actually had their own module with just the mic preamp called the 1290. But since 1073 is the model most people are familiar with, we’ll call it that.) In surveying the current field of 1073-esque preamps, we noticed two distinct approaches; we’ll call these the “three-stage” and “two-stage” designs.\u003c\/p\u003e\n\u003cp\u003eThe original 1073 (and 1290) used three stages. This approach uses two high-gain preamp stages (yes, I know it’s confusing for a preamp to contain preamps, but that’s what they’re called), and one low-gain output stage. Neve split the gain between stages this way to keep distortion consistently low at all gain settings.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe two-stage approach has only one preamp stage, followed by the output stage. This is based on yet another Neve module, the 1272 line amplifier. Around the 90’s people started racking these modules and adding gain switches to convert them into mic preamps. Since then, several companies have made two-stage preamps, often named after the 1073 even though they are closer to the 1272. These can still sound great, and some are highly regarded.\u003c\/p\u003e\n\u003cp\u003eThe two-stage approach is appealing because it reduces cost and complexity. This is especially true for a 500-series module and DIY kit. However, after researching the circuit and evaluating a vintage 1272, we decided against it. In addition to being more faithful to the 1073, the three-stage design allows for more gain and better performance.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/ba283-preamp.jpg?v=1694453255\"\u003e\u003c\/p\u003e\n\u003cp style=\"font-size: .8em;\"\u003eThe preamplifier circuit, of which there are two in the 1073 and one in the 1272.\u003c\/p\u003e\n\u003cp\u003eThis is clear if we look at the original modules. The 1073 provided up to 80dB of gain, the 1272 only 50dB. From 0-50dB the preamps are identical, but from 55-80dB, the 1073 engages the third amplifier stage. Modern, two-stage preamps achieve more than 50dB by increasing the gain of each stage. This pushes the amplifiers beyond what they were asked to do in the original designs. This isn’t necessarily a bad thing, but it’s not how Neve designed their mic preamps. It’s telling that Neve never used the 1272 as a mic preamp, and instead went to the expense of the third stage. For this reason we decided that the three-stage design was the clear choice.\u003c\/p\u003e\n\u003ch4\u003eAdapting to 500-Series\u003c\/h4\u003e\n\u003cp\u003eThe first challenge was how to fit the 1290’s many parts, including two big transformers and one giant transistor and heatsink. However, this was a straightforward problem that just required some grunt work. We also aimed to replicate the grounding scheme of the original. Neve managed ground currents carefully between amplifier stages to keep noise low. We recreated this on the 500-series module by giving each stage its own ground pour, which is tied to the others via a bus wire which runs along the bottom of the module back to the card-edge connector.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/73p-0.6_532ee2d2-9dfc-456c-935a-048914fee2fd.jpg?v=1698172198\" alt=\"\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp style=\"font-size: .8em;\"\u003eOur most recent prototype, with everything fitting in a single 500-series slot. We have at least one more round of prototyping to go, with an improved layout and the TIP3055 transistor.\u003c\/p\u003e\n\u003cp\u003eThe more complex problem was how to handle the power supply. The 80-series consoles ran on a unipolar 25v power supply. The 500-series on the other hand uses a bipolar +\/-16v supply. Therefore, some form of conversion needs to happen to power the 1290 correctly from the 500-series rack.\u003c\/p\u003e\n\u003cp\u003eWe considered several options. First, we looked into adjusting the 1290 circuit to run on +\/-16v. A bipolar +\/-16v supply can also be used as a unipolar 32v supply by treating -16v as ground. In this scheme, some resistor values would just have to be adjusted to make the transistors bias correctly. This has the benefit that no regulation or DC-DC conversion is required, and some high-end 1290-style preamps have used this approach. However, we quickly realized that scaling the bias resistors would also require scaling gain setting and feedback resistors, which would in turn require scaling capacitors, and so on until the circuit barely resembled the original.\u003c\/p\u003e\n\u003cp\u003eThe next approach was to regulate both power rails down from +\/-16v to +\/-12v, thereby creating 24v between the two rails. This is the most common route taken by existing clones. It has the drawback of requiring two regulators or an integrated DC-DC converter, but it does not require any changes to the 1290 circuit.\u003c\/p\u003e\n\u003cp\u003eWe were set on this path when we realized that we could also achieve 24v with a single regulator, by using -16v as ground and regulating +16v down to +8v. This freed up some precious PCB space and eliminated a potential failure point. So we decided on this scheme, but with an important twist: we “deregulated” the +8v rail to get even closer to the original.\u003c\/p\u003e\n\u003ch4\u003eThe Sound of the Power Supply\u003c\/h4\u003e\n\u003cp\u003eAn overlooked aspect of the original console is the design and performance of the power supply. Nothing in analog audio is truly “outside the signal path.” Everything in a piece of gear from the chassis to the power supply affects the sound. The power supply affects audio in two ways: by being quiet or noisy, and by being “stiff” or “saggy.” The first is straightforward—we want to keep noise as low as possible. The second describes the supply’s ability to deliver current while keeping the voltage stable. A “stiff” power supply never drops below its rated voltage. A “saggy” power supply will momentarily drop below the rated voltage when faced with a big spike in the demand for current. These spikes come from especially loud, low-end-heavy sources and increase with gain and level. The sag creates distortion and compression which are part of the sound of the preamp.\u003c\/p\u003e\n\u003cp\u003eModern regulator chips and DC-DC converters are invariably as stiff as possible. So in order to recreate the sag of the 80-series power supply, we simply used the same regulator technology Neve used. Our +24v rail is generated utilizing a zener shunt regulator with a large pass transistor. Think of it this way: if you had a vintage 80-series console, would you replace the power supply with a modern one?\u003c\/p\u003e\n\u003ch4\u003eSelecting Parts\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eTransformers\u003c\/strong\u003e were the most straightforward component to choose. Carnhill transformers are the de facto standard for anything vintage Neve. The blue input and red output transformers have even become visually iconic in their own right. We tested some options from OEP, Sowter, and Ed Anderson, but found no reason to deviate from the Carnhills.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/73p-transistors_600x600.jpg?v=1694453256\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp style=\"font-size: .8em;\"\u003eAll of the transistors we auditioned for the 73P.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTransistors\u003c\/strong\u003e do the work of amplifying the signal. The 1290 card uses two types: eight small-signal transistors, and one power transistor to drive the output transformer.\u003c\/p\u003e\n\u003cp\u003eOur process for choosing them was to compare several currently-available options to a vintage set taken from an 80-series console. These were BC109C for the small-signal, and a Newmarket 2N3055 for the output.\u003c\/p\u003e\n\u003cp\u003eOur takeaway was that transistors are important to the sound, but only when they are saturating. That is, when the preamp was delivering a clean signal with no noticeable saturation, we heard little-to-no difference between the transistors. But once they started to clip, audible differences did emerge.\u003c\/p\u003e\n\u003cp\u003eHowever, even in saturation the differences are not night-and-day. We’re talking about the kind of differences that can only be positively identified with good monitoring and careful flipping back and forth between samples. This is confirmed by Neve’s own approach. When they were making the 80-series consoles, Neve used various small-signal transistors, including the BC107C, BC109C, BC184L, BC184C, BC114 and various brands of 2N3055. Additionally, manufacturing tolerances were much looser in those days, so batches of the same transistor might be as different as one transistor was to another. The takeaway, however, is not that every 80-series module sounded significantly different. Rather, it’s that the circuit is designed to be highly forgiving so that almost any transistor can drop in and sound basically right.\u003c\/p\u003e\n\u003cp\u003eMany of the transistors Neve used are still in production, including the BC107\/BC109, BC184, and 2N3055. However, manufacturing processes have changed so much since then that there’s no guarantee that these would sound anything like their vintage counterparts. So we also tested several other transistors that have been used in this circuit, including the BC550, BC548, 2N4401, MPSA06, MPSA18 for small-signal and the TIP3055 for output. We spent several days exclusively listening to transistors on various samples and at various gain levels deciding on the BC109C and TIP3055.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCapacitors\u003c\/strong\u003e often get a bad rap as something to avoid in audio circuits (have you ever seen “capacitorless signal path” in ad copy?), but they are key to the sound of this circuit. The 1290 uses three types: polystyrene, tantalum, and aluminum electrolytic.\u003c\/p\u003e\n\u003cp\u003eWe know from our listening tests for previous designs that polystyrenes and tantalums have their own sounds which cannot be achieved with more modern options. As such, we didn’t consider replacing them.\u003c\/p\u003e\n\u003cp\u003eElectrolytic capacitors required a deeper dive. In our experience, different manufacturers, series, and even voltage ratings of the same value electrolytic capacitor can sound different. So we wanted to make sure to do our due diligence on this front.\u003c\/p\u003e\n\u003cp\u003eThe main difficulty lay in finding a gold standard to measure against. Electrolytic capacitors have a shorter shelf life than polystyrene and tantalum, so any that could be pulled out of an 80-series console would have long gone bad or at least changed their performance too much to be a gold standard. Additionally, any consoles still in use have been recapped (had the electrolytic capacitors replaced) several times. This further complicates the search for a gold standard. That is, should the reference point the caps that “Rumours” passed through in 1977 or the ones that recorded “Nevermind” in 1991?\u003c\/p\u003e\n\u003cp\u003eSo the best we could do is to trust the techs who have been recapping these consoles for years. They generally recommend the BC 031 series for both sound and form-factor. So we compared a set of 031s against our favorite Panasonic FR series on the same BA283 card. The result was that we found the FR series to be practically indistinguishable from the 031. Based on this, we opted for the FR series as the radial (vertical) mounting style fits better in the 500-series space constraints.\u003c\/p\u003e\n\u003ch3\u003eVersion History\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eVersion 1.1, August 2025:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eReplaced obsolete polystyrene capacitors with WIMA polyester film capacitors.\u003c\/li\u003e\n\u003cli\u003eAdded power soft-start circuitry.\u003c\/li\u003e\n\u003cli\u003eAdded BIAS test points.\u003c\/li\u003e\n\u003cli\u003eIncreased wattage of +48v soft-start resistor to 1W.\u003c\/li\u003e\n\u003cli\u003eMoved PRE 1 and PRE 2 power capacitor to improve PSRR.\u003c\/li\u003e\n\u003cli\u003eIncreased clearance between ground plane and GAIN board screws to prevent shorting when soldermask is scratched.\u003c\/li\u003e\n\u003cli\u003eChanged bias of DI input to eliminate noise when adjusting volume\/tone knobs on guitars with passive pickups.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eVersion 1.0, June 2024:\u003c\/strong\u003e Original version.\u003c\/p\u003e\n\u003ch5\u003eSpecifications\u003c\/h5\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eMic Input Impedance\u003c\/td\u003e\n\u003ctd\u003e1.2kΩ with Lo Z out, 300Ω with Lo Z in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eGain\u003c\/td\u003e\n\u003ctd\u003e0-70dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eLN Impedance\u003c\/td\u003e\n\u003ctd\u003e4.7kΩ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eLN Attenuation\u003c\/td\u003e\n\u003ctd\u003e25dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eDI Impedance\u003c\/td\u003e\n\u003ctd\u003e1MΩ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eDI Attenuation\u003c\/td\u003e\n\u003ctd\u003e35dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eTHD+N @ 20dB gain*\u003c\/td\u003e\n\u003ctd\u003e0.0032%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eTHD+N @ 40dB gain*\u003c\/td\u003e\n\u003ctd\u003e0.014%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eTHD+N @ 60dB gain*\u003c\/td\u003e\n\u003ctd\u003e0.14%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eEIN (Equivalent Input Noise)\u003c\/td\u003e\n\u003ctd\u003e-128dBA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eTrim Range\u003c\/td\u003e\n\u003ctd\u003e-80dB to 0dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eFrequency Response\u003c\/td\u003e\n\u003ctd\u003e±0.2dB 20Hz to 20kHz rel. 1kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003ePower Supply\u003c\/td\u003e\n\u003ctd\u003e±16vDC, +48vDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"question\"\u003eMaximum Current Draw\u003c\/td\u003e\n\u003ctd\u003e120mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e*+20dBu output, 1kHz, 20-20kHz bandwidth\u003c\/p\u003e\n\u003ch5\u003eResources\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/manuals.diy.re\/73p2\" rel=\"noopener\" target=\"_blank\"\u003e73P Assembly Guide\u003c\/a\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/maps.diy.re\/73p2\" rel=\"noopener\" target=\"_blank\"\u003e73P Interactive Build Map\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/73P_1.0_Schematic.pdf?v=1710438646\"\u003e73P Schematic (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/DIYRE_73P_Manual_1.0.pdf?v=1720629009\"\u003e73P User Manual (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/73P_Recall_Sheet_Vertical.pdf?v=1721396960\"\u003e73P Recall Sheet Vertical (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/73P_Recall_Sheet_Horizontal.pdf?v=1721396960\"\u003e73P Recall Sheet Horizontal (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"DIYRE","offers":[{"title":"None","offer_id":46738136039669,"sku":"KIT-112.02","price":400.0,"currency_code":"USD","in_stock":true},{"title":"500EXT","offer_id":46738136072437,"sku":"","price":420.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0698\/2265\/files\/73PThreeQuarterProductPhoto.jpg?v=1714482705"}],"url":"https:\/\/www.diyrecordingequipment.com\/collections\/500-series\/live.oembed","provider":"DIY Recording Equipment","version":"1.0","type":"link"}