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Mbira

Well-known member
Joined
Jun 4, 2004
Messages
2,422
Location
Austin, TX
Hello,
I am starting this thread as a (hopefully) meta contribution. This is a result of my own ongoing confusion as to what transformers I can use with what projects. This is to help me when I come across a big stack of iron that I don't know what to do with. I would like to list each major project we are doing with the transformers that are used for the job. options will be seperated by a semi-colon ";"

So to start:

LA2A:

Input: Jensen JT-11-P1; Jensen JT-11-P;
UTC A-10; A-12; A-16; A-17; A-18; A-19; A-24 (wired backwards); A26 (wired backwards);HA100X; HA-100; HA-101; HA-101X; HA-104; HA-105; HA-106; HA-107; HA-127; LS-10; LS-10X; LS-12; LS-12X; LS-26;
Sowter 4383;
Triad: HS-8; HS-23; HS-25; HS-15; HS-27; HS-28;
Stancor: A-4351, A-4352, A-4726, A-4408
Peerless: K-054-Q; K-063-A; G-323-Q; K-281-Q; G-252-Q;
Thordarson: 25A58; 20A31; 20A08;
Kenyon: K-200; K-201; K-203; K-204; K-205; K-300; K-302; K-304;

Output: Jensen JT-10K61-1M;
UTC A-24; UTC A-25; UTC A-26; UTC-HA-113; UTC HA-114; UTC HA-133; Triad HS-50; Triad HS-52;
Peerless S-217-D; Peerless S-448-Q;
Sowter 8940;
Stancor 3250; 3315;
Thordarson 25S12; Thordarson 24S114;
Crimson Model CT-400G

Power: Allied 6K88VG;

Pultec: (Gyraf)

Input: Lundahl LL5402;
Jensen JT-11-P;
Quote from CJ "Any 600:600, 20-20khz, +15 dbm x-former will work.
Too many to list."

Output: Lundahl LL5402
Jensen JT-10K61-1M;
UTC A-24; UTC A-25; UTC A-26; UTC-HA-113; UTC HA-114; UTC HA-133; Triad HS-50; Triad HS-52;
Peerless S-217-D; Peerless S-448-Q;
Sowter 8940;
Stancor 3250; Stancor 3315;
Thordarson 25S12; Thordarson 24S114;

Power:

G9:

Input: OEP A262-A3E;
Lundahl LL1528; Lundahl LL1538

Output: OEP A262-A2E; Lundahl LL5402

Power:

G1176:

Output: Lundahl LL5402; OEP

Input: Lundahl LL1540; OEP

Power: Digikey TE62045-ND; Digikey TE62055-ND

Green Pre:

Power: Dagnall D2035 (newark or Farnell)


312:

input:Altran C-3402-2;
Lundahl LL1538XL; LL1674 (amphous core); LL1636 (amphorus core);
Cinemag CM-75101APC ;
Jensen JT-115K-EPC;Jensen JT110K-HPC
Sowter 9820;

outputprofile 4804;
Cinemag CMOQ-2L;
Sowter 9825

Power:

Neve 1272, 1290, or 1063/73 minus EQ

mic input Marinair T1444; T1454;
St. Ives VT22670.
Carnhill (who purchased St. Ives) VTB9045
Sowter 9145
JLM Audio 1:4 ? Two of them as a series:parallel (1:2) or parallel:parallel (1:4) pair.
Lundahl LL1538 ? Change cap on the secondary from 180pF to 390pF.
- OEP A262A3E ? Wired for series:parallel (1:3.225).
- or use half of 31267 in reverse for 1:2

line input Marinair T1422; T1442; T1452;
St. Ives VT22671.
Carnhill VTB9046
Sowter 9165

output Marinair LO1166,
St. Ives VT23326(?).
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).
- JLM Audio 1:1:1DC ? Does not require zobel network of 1.5k & .01uF or 600 ohm load on the secondary.
 
Cool idea!
You should mention that the Pultec is the Gyraff ver. w/o the innerstage x-former.

Outputs for the LA2a and Pultec could also be Triad HS-50, Triad HS-52, Peerless S-217-D, Peerless S-448-Q, UTC A-25, UTC A-26, UTC-HA-113, UTC HA-114, UTC HA-133, Sowter 8940, Stancor 3250, Stancor 3315, Thordarson 25S12, Thordarson 24S114,


theres a ton more Sowters Jensens and Lundahls, but getting lazy.
 
Also Sowter web site has the 4383 listed as the input for the LA2A.

Thanks CJ for passing on that knowledge.

Jim
 
Also in case you didn't notice the Allied 227-0113 is Allied 6K88VG (please no offence if you did). Just one is a P/N the other a catalog number. Both numbers will get you the same item.

Jim
 
edited...No offence taken. Many (most) of these projects, I havn't done, so I'm just collecting the info and posting it...

Joel
 
Mbira, great idea. I am building (at least getting the parts) an LA2A.

The trannies are of course the most expensive (

Having list of equivalents Transformers is a great idea since they are the most expensive part of the unit (or ather projects I'm sure). (exception is the Power Transformer which is cheap).

Jim
 
THANKS ........ GREAT IDEA
EXTREMELY HELPFUL

now lets go saturate evilbay with bids...lol

thanks
TS
 
the jensen 110K will also work with a 312. I used a pair in a 312 circuit for a while, defintely works, allows for a little more gain from the opamp with a lower turns ratio than the 115.

dave
 
What about Sowter 9820 for the 312 input (isn't that based on the one CJ dissected by the way?)

And shouldn't the output be 4804? ;) (Sowter 9825)

Dan
 
Input iron for LA2a:

UTC: A-12, HA-100, HA-101, HA-101X, , A-24, A26 (last two wired backwards), LS-10, LS-10X, LS-12, LS-12X, LS-26, HA-104, HA-105, HA-106, HA-107, HA-127, A-16, A-17, A-18, A-19

Triad:

HS-8, HS-23, HS-25, HS-15, HS-27, HS-28

Peerless:

K-054-Q, K-063-A, G-323-Q, K-281-Q, G-252-Q

Stancor:

A-4351, A-4352, A-4726, A-4408

Thordarson:

25A58, 20A31, 20A08

Kenyon:

K-200, K-201, K-203, K-204, K-205, K-300, K-302, K-304

Input iron for Pultec:

Any 600:600, 20-20khz, +15 dbm x-former will work.
Too many to list.
 
Thanks guys-Thanks CJ! I knew this would end up being a long list, but I think this is good for me and other newbees to see the wide possibilities on these projects.

rafafredd-I added the Lundahl. I'll also keep the old model, in case someone has one laying around and doesn't know what to do with it.

Joel

:guinness:
 
.

asm, Profile 4804 is correct for api312 output. (not 4840).
Also Cinemag CMI-8PCCA (1:8) is an option for 312 input.

CJ dissected a 4804 at vacuumbrain... did he do a Sowter too?

Didn't see any JLMs? maybe i missed it on page 1.
Someone familiar with those models?
 
As Soundguy suggested, add the Jensen JT110K-HPC to the list of input trannies for the 312. I have these in a pair of mine.
 
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