[Elecraft] K3 KXV3 fried external pre-amp?

[Dave G4AON]

This afternoon my K3 was on 6m SSB receive and burst into continuous
transmit with a tone output, this wasn't from catching the Morse paddles
as it was a continuous tone. The only way I could stop it was to turn it
off. Unfortunately it seems to have fried my external 6m pre-amp which
was connected to the RF in/out sockets on the KXV3. Has anyone else
experienced this?

73 Dave, G4AON
K3/100 #80