Try Mercury Magnetics. If they're still around, they used to rebuild transformers or might have a matching replacement.
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That preamp as well as TAD amps were made my a Chinese company called BEZ. Paul of TAD would then finished them out with some finishing steps.....
The transformer is most likely a BEZ and they still are in business and sell transformers. I bet you can take the old one out, take a picture and jot down the specs, then email BEZ for a replacement. I heavily modified a TAD 60 and have emailed BEZ thus this knowledge.
Here's an email I got from BEZ this morning:
Sorry this pre amplifier is not our product so we cant repair.
We wish to help you but we only make EI core transformers.
Hoping Mercury Magnetics can help.
Thanks so much for the replies Czarivey, Grannyring and Metman.
Any further thoughts please let me know.
No stickers, no specs. Repair shop wrote down 4 numbers he said were important, think they represent voltage.
on the left (incoming): 110
on the right (outgoing): 200 11 32
If you had a choice between Torid vs CI, would you choose one over the other ? (original was torid)
Mercury Mag said they wouldn't make a torid for audio but could probably make a CI that would work.
Hammond might be able to make a torid version.
I'm in Tampa. The stereo repair shop I took it to
couldn't find anyone that could make a replacement (≤$400 anyway),
as the machinery to make toroid transformers is apparantly very expensive.
As it stands the only option is to send the blown transformer to
Mercury Magnetics and hope they can make a comparable CI version.
But I'm happy to pay you, Grannyring, if you can do it.
Hope you're right, but the search has been nothing but discouraging so far.
Here's the reply from Hammond Mfg:
"Sorry but that would be a custom design very expensive to do but before you ask for a cost I need the amperage for each output voltage."
Is that even possible to calculate from a dead transformer ?