I couldn't help not putting a spin to this discussion. I recently had a
terrible hiss coming from my Icom 740 with the audio gain control at zero. It
led me to bypass the audio output chip of the Icom and run the line level
output to the input of the audio board of my TT 540. The Icom is dead quiet
now with the audio gain control at zero. I am questioning whether or not it
is more realistic to look at a redesign of these circuits in question rather
that a filtering out of the problem after the output. Regards, Bill K6LK
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