Quote:
Originally Posted by TUD1
I've been listening to Coast to Coast for the past hour, and I've noticed a strange phenomenon with this radio. For the first five or six minutes of operation, George Knapp comes in crystal clear. After six minutes have past, the audio slowly starts to degrade. Until after eight or nine minutes, the volume is turned halfway up, and the sound is extremely scratchy. I'm fairly certain that this is a tube. If I turn it off and let it cool down, then turn it back on, it sounds good again and the cycle repeats.
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The audio coupling capacitor is leaky, driving the output tube grid positive.
The output tube is probably bad too.
That cap has to be replaced, first.
