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Looking at the schematic, the 20mfd electrolytic that goes to the screen grid on the 6AU6 only has three parts that bring plate voltage to the 6AU6. A 6800 ohm resistor, and two coils. I would bet the 6800 is good as on my set it is a two watt. The small coils could have some corrosion where they connect to the leads. Looks like they are wound on resistors.
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