Yes, my KPA500  has been doing the same.  Whenever I mention it here on the 
reflector, I get zero response.  I cannot tell whether this is a problem or 
something that is normal.  The pops are very frequent regardless of mode. 
Otherwise, the amp appears to function normally.

Dave, N4QS

----- Original Message ----- 
From: "Joe Word" <joe.n...@gmail.com>
To: <elecraft@mailman.qth.net>
Sent: Thursday, December 08, 2011 11:37 AM
Subject: [Elecraft] KPA500 Heat Expansion Pop


> My KPA500 has developed a heat expansion pop. When it heats up and
> then cools down I get a pop from inside the amp. It does this now
> every time I make a SSB transmission.
>
> Anyone else experience this? If so, any resolution?
>
> Joe  N9VX
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