Partridge 6L6GC OPT

never torched a Partridge, always wanted to, hard to find,

especially the C core models which may or may not have been used in the earliest Marshalls.

but we did find this on youtube , has UL taps at 75%

https://www.youtube.com/watch?v=DR226vwWD3s

can't vouch that is an actual partridge, and have not built it yet, but anything is better than nothing,

looks like a good design, so we wrote it up>

I had a few Partridge output Tx's at one stage ,I traded one designed for EL34s for a massive late 40's williamson transformer and choke set . I had another of the c-core ones you mentioned was for push pull EL84's ,made it into a small guitar amp way way back ,lent it to a friend and never saw it again,he fell in love with a German woman and gave it to her as a present ,end of story.
Usually the secondaries were at least four sections ,so they could match into a range of impedences ,really high quality stuff.
I have the spec sheets somewhere ,I can probably dig em up and post them if you like 

CJ said:

has UL taps at 75%

https://www.youtube.com/watch?v=DR226vwWD3s

Click to expand...

What's the point of UL for shredding with tons of fuzz?
75% is almost triode.

maybe using 75% to side step patents,
or maybe the guy just made a mistake on his tear down, done that before, 


here is a KT66 graph,

CJ said:

never torched a Partridge, always wanted to, hard to find,

Click to expand...

Somebody's gotta say it: "Did you look in a pear tree?" ;D

here is a cool link to transformer data, including Partridge,

which was used exclusively by the Partridge Family in all their stage gear,

http://www.oestex.com/tubes/transformers.htm

If it was good enough for Susan Dey's Wurly, it's good enough for me.