Bret said:

http://www.transformers.co.uk/index.asp?pgid=27

I've had acquaintances on the dentally challenged lilly pad contact
them in the matter and they do not supply Partridge audio transformers
on any regular basis or even willingly answer enquiries.

Still...

A couple of years ago, I got through direct to the abandoned wooden hut where
the audio winding crew are kept. An old guy, tripping over his words with
helpful enthusiasm, sent me a catalogue of OPTs, PTs and chokes.

Later when I rang up for a quote, the existence of such a department was
curtly denied by
well-briefed staff at every level. I guess they took the phone from the shed.

Shame. The trannies were the real McCoy, so to speak.

Ian