[Elecraft] K3: output power low only on 17m SSB!!

[Brian Machesney]

I'm hoping someone else has experienced this, because it's too weird for me
to figure out.

When I QSY to 17m phone and begin to speak into the mic, I get very low
output power. The only way I can get to full output is to switch to CW and
begin transmitting, during which I see the output power rise to the
expected 100W. This is the only band on which this problem occurs.

Using the latest firmware.

Any clues?

Brian K1LI