This is on a mk4 VTA board. I checked R13 and R11(150K,68K) and they checked A-OK, but I swaped them out anyways just in case they went off value when under load. No cigar, I'm still getting 147v on one board and 163.8v on the other one. This is taken at pin 1 of the power 12AT7 (is that what it's called?)the non splitter one. Could it be C13, C15 or R15,R19? I'll pull and check those tommorrow, but I thought I'd ask wiser minds, first. The reason I started tracing the Volts is because I can't get the bias up past .36 on the amp with the low V on pin 1. Tubes all test good on a Precision 10-12 tube tester. B+ is 423 VDC at the board terminal.
Gordy
Gordy