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Tim Schwartz
 
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Default HELP: Fisher 500-T Receiver, Why Right Ch Weak, esp Bass ?

Hello,

It is quite likely that some of the coupling capacitors, either in to
the power amp, preamp or tone controls have failed. The best way to
really troubleshoot this unit will be to feed in a sine wave to both
channels, and look a various points in the circuit with a scope probe. A
schematic would make this much easier.

A coupling cap that has gone (nearly) open will allow some higher
frequency through, but will certainly kill the base off. These caps, at
least the ones that usually fail are of the electrolytic type, and
usually 10uf or less in value.

Please note that a broken pot in the tone controls or filthy switches
and controls could show similar problems.

Regards,
Tim Schwartz
Bristol Electronics


wrote:

HELP: Fisher 500-T Receiver, Why Right Ch Weak, esp Bass ?

I have a Fisher 500-T Receiver, probably around 1967 vintage.. plays in
stereo, but right channel definitely plays weaker than left, esp bass
response.. receiver has 2 - 3 large, original capacitors.. could these
be the problem? If anyone can suggest some probable causes and how to
diagnose, would greatly appreciate.. thanks for any help.