Quote Originally Posted by E-Stat
Although I'm not JoeE SP9, I also have one myself. These look like doughnut trannies to me:

REF 7 CDP

REF 3

PH7

And lots of paper in oil caps.

rw
The REFCD7's transfo looks like a hybrid, if we can call it that. So does the PH7.
The REF3 seems to have one of each, oppositely mounted:
http://www.arcdb.ws/REF3/ARC_REF3_top2.jpg

This supposedly is the SP9 MKIII:
http://images.google.com/imgres?imgu...6rlz%3D1I7ADBF

Looks toroidal to me. It's mounted sideways.
I'm guessing by doughnut you mean toroidal?