No bias readings in st70 right channel

Hello all,

I recently purchased and installed the VTA board in an st70 and cannot get a bias voltage reading on the right channel. The left channel seems just fine. I have the triode switches wired in, if that makes any difference. From what I can tell from all of the photos and schematics I have, everything is connected properly. Where should I begin to look for problems? All tubes light up, including the rectifier. I have not even checked other voltages.

Thanks for any help folks!

Ok, today I fired the amp up and checked the negative DC voltages on pins 5 and 6 of the 2 right channel output tubes and got -38.2 on pin 5 V-6 and -38.2 on pin 6 V-6. I got -39.4 on both pins 5 and 6 on V-7 as well. The same tube pins on the left channel are only slightly higher at -43.7 on 5&6 of V-3 and -42.6 on 5 and 6 of V-2

High voltage is a different story. On pins 3 and 4 of V-3 I get 472v. Same reading on V-2. On V-6 I get anywhere from 4-7 volts on pin 3 and 5-7 volts on pin 4. On V-7, the meter starts at .300 volts on pin 3 and slowly drops off. On pin 4 it's all over the place.

I have checked and re-checked the wiring to the switches, and they are correct according to the diagram I printed off. Should I be looking at the power transformer as the culprit?

Thank you!

Well, I just measured the cap like you said, and I get a slightly higher reading (477v) than the pins on V-3 and V-2, and almost 0 volts on the right channel tubes. Do you happen to sell output transformers???