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Old 23rd Jun 2012, 3:29 pm   #11
Alistair D
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Join Date: Jan 2010
Location: Edinburgh, UK.
Posts: 2,008
Default Re: NAAFI receiver problem

The 6K7 has a -96 volt bias on it. No signal will pass at that level.
Confirm if R3 is the correct value. If the problem remains you need to pull one of the valves and re-measure the cathode voltage. Repeat the process with the other removed. I would normally expect the cathode voltage to be somewhere between 5 and 10 volts.

Al
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