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December 16, 2019 at 7:06 pm
#8133
AndyKeymaster
The next step is to super check all of your grounds. In particular, the panel mount pots. Make sure all your grounding is solid.
After that, I would take some voltage readings and let us know what you get. Pins 1 and 6 of the tube should be around 140-160V. Pin 3 on the power tube should be around 350V, Pin 4 around 300V.