These type of problems with audio may be from a bad solder joint, or non
soldered joint, or cracked solder joint. If you tap the shaft of the
volume control, does that restore the audio? That could be a bad pot
wiper, or a bad spot on the pot at the usual volume setting. Control
cleaner might help if sprayed into the pot. (assuming a pot with open
access like 2 watt non military pots.).
The other technique is to tap any wire interconnect jumpers, again
looking for a bad connection. Unplugging and replugging any jumpers
with connectors clears many a volume problem.
GL and 73,
Stuart Rohre
K5KVH
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