Transformer lists for projects.

[Mbira]

Got it-I was too lazy to see if those were input or output iron.

Joel

 

[Family Hoof]

Great thread! I love seeing this kind of organization.

Shouldn't we list the turns ratios/secondary loading conditions for each application to assist in wiring and finding even more substitutes?

Since many people have built them, allow me to add...

Neve Class A preamp (1272, 1290, or 1063/73 minus EQ)

mic input ? Secondary loaded with 4.8k (~5k) yields 1200 input when 1:2 (series:series), or 300 input (parallel:series). Originally made by Marinair, part # T1444, or T1454; and later by St. Ives, part # VT22670.
currently available substitutes:
- Carnhill (who purchased St. Ives) VTB9045
- Sowter 9145
- JLM Audio 1:4 ? Two of them as a seriesarallel (1:2) or parallelarallel (1:4) pair.
- Lundahl LL1538 ? Change cap on the secondary from 180pF to 390pF.
- OEP A262A3E ? Wired for seriesarallel (1:3.225).
- or use half of 31267 in reverse for 1:2

line input ? Wire seriesarallel (4:1) for 10k input. Neve part # 31267. Originally made by Marinair, part # T1422, T1442, or T1452; and later by St. Ives, part # VT22671.
currently available substitutes:
- Carnhill VTB9046
- Sowter 9165

line output - DC gapped, series:series (1:1.5) for 600 ohm output. Neve part # LO1166. Originally made by Marinair, part # ?, and later by St. Ives, part # VT23326(?).
currently available substitutes:
- Carnhill VTB9049 (original replacement), VTB1148 (narrow for rack mounting), or VTB1847 (PCB version w/breakout leads).
- Sowter 8751 (regular size), or 9160 (narrow version for 1RU cases). Both available with leads or solder tabs.
- JLM Audio 1:1:1DC ? Does not require zobel network of 1.5k & .01uF or 600 ohm load on the secondary. Fits in 1RU with at least 38mm internal height.
- Lynx Audio AT600/600-G

Please correct me if this is: a) too detailed, b) has errors, c) missing any info.

 

[Mbira]

Family Hoof,
Thanks for the work. I have added the info to the first thread. I was hoping to keep things in this thread to the specific format of my first post. I think you're right that your suggestestion of listing the turns ratios/secondary loading conditions for each application is a good one-maybe we could start another thread with that info easilly accessable. I just wanted to have this be one place where you could look at a list and see lots of different iron options...

That said, I don't own this thread or anything.
:guinness:

Joel

 

[nacho459]

I know I ended up using the same Jensen JT-11-P and JT-10K61-1M transformers on both my LA-2A and G-Pultecs.

 

[asm]

what about the transformer for the MXL 2001 mic with Royer mod (5840 tube).

i know people are using a jensen trans in it, i'll try to find out which model, can you use anything else?

t

 

[Chuck78]

Should this end up in the Meta when finished???

 

[clintrubber]

This is a great initiative, thanks all !

Additional suggestions:

W.r.t. the 312, there's at least one API-channel known to man that uses two OEPs (from a DIY-brother from Spain) and it seems to work well (with a 1731-DOA).

Also: Fabio's boards have an OEP-input possibility.

So 312-input: OEP A262A3E and 312-output: OEP A262A2E.
(anyone else having used these two for an API ? I'm going to)

Regards,

Peter

 

[Mbira]

-edited-

Nacho, are those input or output iron?

 

[Bluzzi]

Also I found a ref. to the Crimson Model CT-400G for the LA2A as an output transformer.

Crimson Audio Transformers
PO Box 244
Cape Girardeau, MO. 63702

(573) 334-6656 or (800) 434-1107

I found no web site.

Jim

 

[nacho459]

[quote author="nacho459"]I know I ended up using the same Jensen JT-11-P and JT-10K61-1M transformers on both my LA-2A and G-Pultecs.[/quote]

JT-11-P = input
JT-10K61-1M = output

 

[Mbira]

-updated-

 

[Family Hoof]

Mbira,

You should probably just put LO1166 for the N*eve output Marinair #. Sorry for not being clear. Tell the moderators: This must become a meta!

 

[CJ]

I can paste this on the x-former meta once it gets to where ever it is going.

 

[Mbira]

-updated-

 

[chrissugar]

CJ , Do you have a recomendation list for the V72, V76.

Also anyone made some experiments with transformers for the REDD47?

chrissugar

 

[mike_relay]

[quote author="asm"]what about the transformer for the MXL 2001 mic with Royer mod (5840 tube).

i know people are using a jensen trans in it, i'll try to find out which model, can you use anything else?

t[/quote]

I'd be interested in this as well.. Also the transformer for the 603 tube mod...
-mike

 

[dukasound]

[quote author="mike_relay"][quote author="asm"]what about the transformer for the MXL 2001 mic with Royer mod (5840 tube).

i know people are using a jensen trans in it, i'll try to find out which model, can you use anything else?

t[/quote]

I'd be interested in this as well.. Also the transformer for the 603 tube mod...
-mike[/quote]
Mike transformer for Royer mod is Jensen JT-DB-E or JT-DB-EU (where is EU uncased if you have MXL, ADK, Generis with transformer case inside mic).

 

[ToobieSnack]

Hey, I'd be intereseted in knowing about the V72 and V76 iron too.
Also can someone list mic trafo's.
I need one for my RCA 74b ribbon mic and
or a tube mic like my neumann cm7156? or the graf tube mic?
thanks
TS

 

[smilinfu]

I am using the LL1578XLs and some LL1636s in my API 312s, but I really have almost no idea what I am doing :shock: . They are 1:10 instead of the 1:5 a lot of folks use (I have not tried 1:5 so I have no comparison). This list could get huge, as there are so many options for so many projects.

Anybody have info on the LA-3 ins and outs?

 

[dukasound]

Hi
I can find one UTC HA-108 transformer. I know some specification but for what is this transformer useful. Also where are this transformers embedded.
Thanks
Duka