Hello! Just finished a scratch build AB763 build. After my usual routine of first time power up I was enjoying the tone of the amp at low volume. Happy to have little to no hum or buzz (even on the reverb!). When I dug in to the strings however I got a nasty jump scare/loud distortion. Checked voltages and everything is right on except the plate of the PI (12ax7) at pin 1. Pin 6 (other plate) is 335vdc from node C across 100k res. Pin 1 however is 449vdc! That 82k res is only dropping 4 volts? Tried with no PI installed, swapped 3 different 12ax7 and replaced 82 k res. All same results. Kinda stumped here...I'm just assuming at this point that the loud distortion is a symptom of this anomaly. Schematic shows 320vdc at both pins 1 and 6 of the PI.