Model 60 issue - Printable Version

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Model 60 issue - 45philcodon - 11-12-2021

After replacing resistors and capacitors on a late model 60, I get no audio whatsoever. The B+ is over 400V at full line.
I've limited the line voltage such that the voltages at each plate are approximately correct.

The output tube is biased off with ~-2.5V. The top of resistor 47 measures ~-2.6V indicating ~ 10 MA current draw.

What should the voltage be at the top of resistor 47?

Thank you,
Don

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RE: Model 60 issue - Steve Davis - 11-12-2021

Don, it sounds like the output tube is drawing no current, could be an open output transformer. Check the voltage on the 42 plate.

Steve

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