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Originally Posted by andy
I added a 22 ohm resistor in series with the power supply filter choke which brought the 390v supply down by about 10v to around 385-390v.
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Before doing this, why not lowering the screen grid voltage of the horizontal output tube? If you could scan the schematics for the line output unit, it would help us here.
185 mA seems to be OK.
Have you checked the wave form of the signal at the grid of the line output tube?
Eckhard