Output tranny ID please

[swingarm]

I got this in a lot of transformers. Seems it might be a sound city, but I'm not sure any ideas?

[swingarm]

One more pic

[J M Fahey]

Draw a winding schematic, showing colours and DC resistance between terminals, then we'll suggest how to test it.

Also post EI iron external size, as witdth A, height B and stack thickness to estimate power .

[Audiotexan]

Juan's a guru on these types of things...so I'll definitely be interested in keeping up with your reply and info to him to see what shakes out!

But in the meantime, I think you're on the right track.
Looks *very much* like a Partridge transformer to me. And those were used in Sound City amps (as well as others).

There's a site that I have bookmarked (that I jumped back to compare) and it has some shots that seem to confirm initial suspicions.

There's some pics of a Sound City 120R output tranny (far right in pic) that bears a very similar wiring/color pattern on the left, however, I'm not seeing any green pair on the right.

But the internal chassis pic (top right corner) of that output tranny does show a brown pair, an orange pair, a red pair, and possibly a yellow pair as well (hard to tell with the size of that pic).

Anyways, hope this helps. Will be watching to see what pans out! =)

PS: FWIW, it would seem that the late-60's Partridge transformers didn't have the holes in the wiring plates, and the ones from the 70's do. So that might also help "date it" (or get closer anyways).

[swingarm]

Thanks for the replies fellas,

I should mention someone has labelled the OPT with red ink

It says

black - 0
orange- 4
green - 8
brown - 16
red - 100v

red- plate
black - center tap
orange- plate

maybe this will solve the mystery?

[swingarm]

I got home and measured

here is what I came up with. BTW, 3 7/32 should be B labeled it wrong in the drawing