"... It's a little more subtle than a continuous buzzing along with the
tones of CW. Sort of a scratchy sound. I thought it was in the audio, but
no, it's gone when I use headphones
or an external speaker..."
I had this same problem on my K3. Headphones and an external speaker both
sounded good. It turns out that the K3 speaker was bad. Take your cover
loose and hold it above the K3 while still listening to the speaker. If it
is still buzzy/scratchy, then the speaker is bad. Elecraft replaced the
speaker and everything sounds great.
Phil - AD5X
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