[TenTec] 540/Triton Transmit Audio Distortion

[Bill ACITO, W1PA]

Update

Due to having a second rig (a Triton IV), as well as some “extra” boards I have picked up over the years,
I was able to swap out all of the critical boards in the rig, including the PA module,
with no appreciable change in the distorted output (everything but the NB, CW filter, and the calibrator). 
Likewise, I was able to put the known-good Triton on the dummy load and could hear “good  audio” on the 
second receiver – so it’s not an overload issue with the monitoring rig.

My focus will now be on the switches, sockets, off-board discretes and cable harnesses in the 540.
e.g. there are some caps in line and across the mic input before the SSB Generator board.

Does the 540 run in class A-B in both CW and SSB?

Bill
W1PA