[R-390] r-390 Gain

[Steve Hobensack]

Mike,
 I had a similar problem once. There was still audio when the AF gain was at zero. I found a leaky capacitor or open capacitor in the AF module. I forget which one, but it was allowing audio to flow from the line audio section of the module to the local audio section of the module. It could have been one of those large filter capacitors on the dc line that failed. It let DC voltage pulsating at an audio rate to 'modulate' the local audio DC screen voltage.
Regards
Steve  N8YE

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