Work in Progress: The Ultimate Audio Transformer List December 9, 2011 17:37 12 Comments
How awesome would it be to have a list of every transformer you'd ever want to use in a DIY project? Let's do it! Please leave your contributions in the comments section. Thank you to Justin Boland for getting us started.
*Indicates that this was the original transformer used for this purpose.
| Manufacturer | Part # | Type | Turns Ratio | Impedance Ratio | Used By |
|---|---|---|---|---|---|
| Carnhill | VTB9045 | Mic In | Neve | ||
| Marinair | 10468 | Mic In | Neve | ||
| Ed Anderson | EA10468 | Mic In | Neve | ||
| Sowter | 9145, 9165 | Mic In | Neve | ||
| Carnhill | CA-18-VTB9071 | Line In | Neve | ||
| Marinair | LO-1166 | Line Out | Neve | ||
| Marinair | LO-2567 | Line Out | Neve | ||
| Carnhill | VTB1148, VTB1847, VTB9049 | Line Out | Neve, Trident | ||
| Ed Anderson | EA1166 | Line Out | Neve | ||
| Sowter | 8751, 9160 | Line Out | Neve | ||
| Sowter | 9780 | Line Out | Neve | ||
| Cinemag | CMOQ-2S | Line Out | Neve | ||
| Crimson Audio | CT-2385 | Line Out | Neve | ||
| JLM Audio | JLM111DC | Line Out | Neve, Trident | ||
| API | 2622 | Mic In | 1+1:7 | 150/600:10k | API |
| Ed Anderson | EA2622 | Mic In | 1+1:7 | 150/600:10k | API |
| Cinemag | CMMI-8PCA | Mic In | 1:8 | 150:10K | API |
| Sowter | 9820 | Mic In | 1:4.37 | 150/600:11.5k | API |
| API | 2503 | Line Out | 1:1, 1:2, 1:3 | 75:75, 75:300, 75:600 | API |
| API | 2623 | Line Out | 1:1, 1:2 | 75:75, 75:300 | API |
| Ed Anderson | EA2623-1, EA2623-4 | Line Out | 1:1, 1:2 | 75:75, 75:300 | API |
| Ed Anderson | EA2503 | Line Out | 1:1, 1:2, 1:3 | 75:75, 75:300, 75:600 | API |
| Sowter | 9825 | Line Out | 1+1+1+1 | 75:300+75 | API |
| Cinemag | CMOQ-2L | Line Out | 1:1 | API | |
| API | 2164 | Line In | 10k:600 | API | |
| Jensen | JT-16-B | Mic In | 1:2 | 150:600 | John Hardy |
| Jensen | JT-11-BMQ | Line Out | 1:1 | 600:600 | John Hardy |
| Jensen | JE-6110K-APC | Mic In | 600:150/10k | Auditronics | |
| Jensen | JE-123-S | Line Out | 1:1 | 600:600 | Auditronics |
| Sphere | 7341 | Mic In | Sphere | ||
| ZUTT | 012A, 782A | Mic In | 1:5.63 | 1.2k:38k | Trident A, B, and Fleximix* |
| ZUTT | 783A | Line In | 1:1 | 15k:15k | Trident A, B, and Fleximix* |
| Sowter | 7456 | Mic In | 1:5.9 | 600/30K | Trident |
| Jensen | JT-13K7-A | Mic In | 1:5 | 150:3.8k | Trident |
| Sowter | 3553, 2318, 3777 | Mic In | Calrec* | ||
| Sowter | 3955 | Line Out | 1:1.06 | 600:600 | Calrec* |
| Triad | A-67J | Mic/Line In | Spectra Sonics* | ||
| Triad | HS56 | Mic/Line In | 1:1 | 600:600 | Pultec, Spectra Sonics |
| Sowter | 3603 | Mic/Line In | 1:1 | 600:600 | Pultec, Spectra Sonics |
| UTC | LS30 | Mic/Line In | Spectra Sonics | ||
| Triad | HS66 | Line Out | Spectra Sonics* | ||
| St. Ives | VT22670 | Mic In | Neve* | ||
| St. Ives | VT22671 | Mic In | Neve* | ||
| Marinair | T1422, T1442, T1452 | Line In | Neve* | ||
| UA | 5002 | Line Out | UREI 1176 Rev A-E* | ||
| Bournes | B11148 | Line Out | UREI 1176 Rev F-H | ||
| UTC | 012 | Line In | UREI 1176 | ||
| Jensen | JT16A | Mic In | Sunset Sound Console | ||
| Edcor | PC10k/150 | Line Matching | 8.2:1 | 10k:150 | LINE2AMP Reamping Box |
| Cinemag | CM-9888 | Mic Out | 1:28 | Ribbon mic | |
| Lundahl | LL2912 | Mic Out | 1:37 | Ribbon mic | |
| Sowter | 8074 | Mic Out | 1:40 | Ribbon mic | |
| Edcor | RMX1 | Mic Out | 1:37 | Ribbon mic | |
| AMI/TAB Funkenwerk | T42 | Mic Out | 1:42 | Ribbon mic | |
| AMI/TAB Funkenwerk | T58 | Mic Out | Shure SM57/SM58 Mod | ||
| Samar Audio | RT36 | Mic Out | 1:40 | Ribbon Mic | |
| Monacor | LTR-110 | Line Matching | 1:1, 2:1 | ||
| Monacor | DIB-110 | Direct Box | 10:1 | ||
| Lundahl | LL1538 | Mic In | 1:5 | Focusrite, Trident, GP Electronics | |
| Lundahl | LL1517 | Line Out | 1 + 1:1 + 1 | Calrec | |
| Altran | C-3837-1 | Line In | 1.58:1 | 500:200Ω | DIY 1176 |
Comments
paul on November 12, 2014 18:00
Jensen JT-16A; Sunset sound console mic pres
100WChris on November 12, 2014 18:00
UTC LS10X used by passive DI-Box
Tom McCartney on November 12, 2014 18:00
I also like the Hammond 133 600 to 600 ohm isolator transformer. Very rare. I still have a case of them. I’m also a big fan of the Hammond 840 series. Very well shielded for my tube designs. Cheers
Kasumi on November 12, 2014 18:00
I was fortunate in that I had a lot of old trnosfarmers to experiment with WITHOUT having data on them so I had to learn to figure out what they were by testing. That was invaluable experience. Generally, with a sine wave generator and a DMM you can figure out 99% of trnosfarmers as to intended function and the necessary specs. Power throughput is generally a matter of weight, then you test for temperature rise to see if it’s what you need in terms of capacity. But it’s a lot of fun to read the manuals too-as long as you understand they were trying to sell trnosfarmers! Ed Romney in his Fixing Up Nice Old Radios has some very useful catalog excerpts and comments. He is dead and I believe his widow is as well, now. I hope someone reprints his books.
Jens J. on November 12, 2014 18:00
Marinair didn’t make ZUTT; ZUTT made ZUTT. It was some local junk purchased from the back of a surplus parts truck, which Trident chose because they were unable to buy Marinairs in the first place. Either XUTT 782A or ZUTT 012A in A Range, B Range, and Fleximix as Mic In 1:5.63 1.2k:38k The Line In was XUTL 783A 1:1 15k:15k, if I recall correctly.
Jens J. on November 12, 2014 18:00
Additions:
- Neutrik NTM4, NTM1, and NTL1, as rebranded for so many Studer consoles.
- Lundahl LL1538 and LL1517 used in Calrec and Focusrite consoles.
- Altran C-3837-1 (UTC 012, fixed ratio) 1.58:1 500:200Ω for 1176 clones.
- Cinemag CMQEE-3440APC 1:18.26 150:50k Quad Eight Mic In.
- beyerdynamic TR/BV 3.10.xxx series, as used in Ampex tape machines and mixing consoles. Typical ratio 1:5
- Jensen JT-115K-E (or EPC) 1:10 150:15k API 512 Mic In
Matt Houghton on November 12, 2014 18:00
Good work. A few more random additions for your list, taken from notes I had to hand when I saw your post. Most should be accurate, but I’ve added questions where I can’t verify it right now.
You really should write to Sowter, Carnhill, Lundahl etc, as they’ll have a pretty extensive list of this stuff — they’re making thigns to the same spec as all these out of production xformers after all! Anyway…
Altran C4330, Line In, Slate Pro Dragon compressor
Altran C4000, Line Out, Slate Pro Dragon compressor
Jensen JT-11P-1TB, Line In, used in Vertigo VCS-2
Manley 9811, Line Out, Massive Passive plus optional on Mini Massive
Lundahl LL1538, Mic In, 1:5 turns ratio, used in Focsurite ISA preamps, GP Electronics PML200E, and in Trident 80B (I was given to understand that the original Trident used a Bellclair model with the same turns ratio, though can’t verify this?), among others.
Lundahl LL1588, Line Out, GP Electronics PML200E
Lundahl LL5402, Line Out, MC AudioLab TP1tp
Lundahl LL1540, Line In, IGS Audio Tubecore ME
Lundahl 1527, Mic in, Optional addition to Raindirk RM4 channel strip
Lundahl Amporphous Core, Line, Out, Knif Soma EQ (fascinating read about why they picked these ones: http://www.knifaudio.com/pdf/Quality%2520factors%2520in%2520pro%2520audio%2520equipment.pdf)
Sowter 9745, Line Out, IGS Tubecore ME
Sowter 8403A, Line Out, Optional addition to the Buzz Audio MA2.2 & SSA1.1
Sowter 1196 (custom wound), Mic In, Ingram Engineering MPA685 (uses Jensen outs but not sure of the model)
UTC A-10 – am I right in thinking this is what the original LA2 used for input?
And UTC A-24 for output?
I also have a few chunky vintage 1:1 audio transformers marked ‘Swavesy’, which is a village near where I live, a couple of miles down the road from St Ives. Anyone know anything about these? I’m struggling to find reliable historical info online…
Jonathan Little on November 12, 2014 18:00
If you think the Zutts mic input xfrmrs are junk, sell me what ya got! Great sounding xfrmr, to me ears at least, a big part of the Trident A range sound. 8-)
Dave on November 12, 2014 18:00
Optimus Prime
Brian Knight on November 12, 2014 18:00
forgot the UTC HA100UX original LA2A transformer.
Raffaele on November 12, 2014 18:00
Reichenbach RE 887 found in DeMedio Api Modded 312 mic Pre
J on November 12, 2014 18:00
Monacor LTR-110 (1:1 and 2:1 with center tap)
Monacor DIB-110 (10:1)
Monacor is cheap and is widely available here in europe.
The Neutrik audio transformers should also be mentioned, i think:
NTE1 (1:1)
NTE4 (1:4)
NTE10 (1:10)
Types with MuMetal Shield:
NTM4 (1:4)
NTL1 (1:1)
NTM1 (1:1)
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