The video may not be that helpful Here are the facts. 6146 were swapped out with no change, noted 22 ohm resistor in the plate cap was cracked, likely a result of the over current. If I remove either 6146 current drops by about half, if I remove them both very little current. bias voltage on 6146 -35v, adjustable -37 to zero. Output of bias rectifier -175, after 1k resistor -140v screen voltage on 6146 125v resistance on modulation transformer primary 70 ohms, 37 ohms center tap but I notice 7 wires coming from the modulation transformer, not six as indicated on the schematic although two are connected together. What are really need are normal voltages as none are on the schematic.