[Elecraft] K3 apparent PA failure

[gfinch at maine.rr.com]

Had the same thing happen here to my K3s but only with the high power board. The low power 0 to 12 watt board continued to work normally. Tried a transmit gain calibration with no effect.
I sent it back to Elecraft and they replaced both the low and high power boards with revisions they deemed "more stable" - KPA3A Rev C9, and KLPA3A Rev B3. Greg, W1GF