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To add to Old Coots' post: there are two brown wires that run on TOP of the PCB between the 6GU7s and the 6GY6s. These carry filament voltage to 6GU7/6GY6 on right side, and due to heat, corrode to green dust where they enter the PCB hole.
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"When resistors increase in value, they're worthless"
-Dave G
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