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Model 60 issue
45philcodon
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Posts: 95
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City: Fountain Hills, Arizona
#1

11-12-2021, 02:33 PM
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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Steve Davis
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City: Linn Creek, MO
#2

11-12-2021, 03:13 PM
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
M R Radios   C M Tubes
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  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration