[Elecraft] [k3] Audio distortion on strong CW signals - after a while

[Pete Smith]

This is something I have noticed in contests recently, and just now in a 
qso with a strong local - after a few minutes, the audio becomes 
distorted, what we used to call a T7 note.

I have read about distortion caused by banging up against the audio 
limiter, but this happens even at very low audio output.  I also have 
the impression that it does not occur when I first turn on the radio, 
and that when I'm transmitting a lot, in contests, it starts to happen 
earlier and earlier, sometimes emerging at the end of a brief contest QSO.

Amp or no, makes no difference, and it appears to happen on all bands.

Any ideas?

-- 
73, Pete N4ZR

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