I am having a problem with my Fisher 800C in that when in FM stereo filter mode,
the left channel is really attenuated (Quiet).(all stations)
L and R are loud and clear in FM mono mode so I don't think it's anything in the audio section.
I've heard about upgrades to these tuners something to do with old de-emphasis circuitry that is not compatible with modern
broadcast??
Please help.
the left channel is really attenuated (Quiet).(all stations)
L and R are loud and clear in FM mono mode so I don't think it's anything in the audio section.
I've heard about upgrades to these tuners something to do with old de-emphasis circuitry that is not compatible with modern
broadcast??
Please help.
Found the problem
Wow I can't believe no one responded to this tempting puzzle.
For the benifit of anyone who runs across a similar problem
it turned out to be a (partially)bad 12Ax7.
Swapped the tube and problem was gone.
From now on I will suspect 40 year old tubes first.
Wow I can't believe no one responded to this tempting puzzle.
For the benifit of anyone who runs across a similar problem
it turned out to be a (partially)bad 12Ax7.
Swapped the tube and problem was gone.
From now on I will suspect 40 year old tubes first.
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