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Columbia 817-6
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04-30-2016, 10:08 AM
old_coot88
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Join Date: Sep 2009
Posts: 2,645
If the 60 ohm resistor checks good it's not the problem. Is it running unduly hot by any chance? Have you subbed the 5U4 with a known good one? What's the B+ voltage directly at the 5U4 filament?
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