[Elecraft] K3 problem

[Jerry Pittenger]

Well it looks like I have a problem.    There is an intermittent buzz on the
speaker audio.   When I turn on the radio it works perfectly.  But after a
few minutes a strong buzz overlays the audio.  It is sever.  You can hear
the stations under the buzz.   If I turn the radio off and immediately back
on, the buzz is still there.  However if I leave the radio off for 3 or 4
minutes and turn it on, it is fine for a few minutes and then the buzz pops
back on.   Also keying the radio on CW also seems to fire up the receiver
buzz.   Note that it is okay on a pair of headphones.  It is like it is
going into oscillation.  Everything else on the radio seems normal. 

 

Any suggestions?    I suspect a component in the audio amplifier.   Does the
headphone jack take the audio signal before it hits the main audio amp?
I wish I had a set of circuit diagrams.

 

Jerry K8RA

 

 

 





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