[Elecraft] KPA500 audio muffled?

[ke9uw]

Thanks Eric on the voltage being normal. I thought I'd change things to
possibly get some more data on what it is not, and at least keep the pilot
lights on the 120vac strip from blinking slightly. 
 There was also a comment on my email (but hasn't appeared here) that I
should look into RF getting into my mic input. I am doing that and I know
that I have some RF floating around here having gotten into the pc monitor,
etc. I like that as a possibility although these critics I mentioned are
very good at recognizing RF in the audio. But maybe just a tad can produce
the results they seem to have noticed. And the correlation with higher power
is obvious.
 I think there is also some "transistors just don't sound good...get
yourself a four by one and do some real QRO". I am aware of that bias as
well.
 I really like this KPA500 amp.

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Chuck, KE9UW
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