Does the audio gain control change the loudness of the "static"?
~Damon, W7MD

On 09/03/2011 05:01 PM, [email protected] wrote:
> For about 20 minutes after being turned on, R-4A ehibits static building
> from low to high volume over about 10 seconds, followed by a "pop", then
> repeat.  AGC setting and band selected makes no difference.  Happens
> with or without signal input.  After about 20 minutes, the static goes
> away and the receiver performs normally.  I'm guessing this is a
> marginal tube in the audio chain?
> 
>  
> 
> 73, Curt KB5JO
> 
> 
> 
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