when I tuned up my Argosy a while ago I did it to spec...I kept getting
complaints of distorted audio, however...it took me forever (as it often does)
to find the bias was too low despite d=being what it called for in the manual.
Your problem may be simpler in nature and if it was working OK before, its
unlikely its your PA...that said, have a look if the simpler route does not
help. When I realized I had to exceed the current limit a bit I simply listened
in a separate receiver for clear audio...
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