In article .com,
"Capt Jack" wrote:

Yes, I have tried all the obvious...different power suppies,
headphones, etc. I have eliminated all the simple possible problems.
Looking for technical knowledge of component failure that would cause
audio failure.

Look around for cracked solder connections on the circuit boards or
connections to the controls.

Sometimes the quick and dirty method of using non-polar electrolytic
capacitors in the single digit range is used to AC connect the audio
between circuits. They can dry out and usually this also causes low
volume along with the distortion.

If an IC amp is used look at the decoupling capacitors for it. Those
capacitors should be right next to the IC amp.

--
Telamon
Ventura, California