I am trying to rehab an old SCA35. The colors on the leads of all the transformers have faded to the point where no identification is possible. I worked out the power transformer by measuring resistance between the various leads and matching it to the schematic, but I am having trouble with the Z565. From the schematic, the highest resistance is between BL/W and BL. I measure that to be ~450. I had guessed that the two twisted pairs (BL/W-GR/W & BL-GR) would be the same, but they are not! One pair measures roughly double what the other does. Also, the red "center tap" is not centered, but sits at about the 40/60 point. (I actually think I remember something about the 'ultralinear tap' being @ 40%, but I don't know from which end!)
So my question to any of you who might have a SCA35 and be willing to pull the tubes and measure the resistance between pins 7-9 of V5 and 7-9 of V6 (or V7&V8) and tell me which is higher? If my transformers are any good, one set should measure in the 160-180 range and the other 265-310, so very obviously different. A ST35 should be the same as it is the same transformer. In that case it is pins 7-9 of V2 & V3 (or V5 & V6).
Thanks for the help!