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HELP: Fisher 500-T Receiver, Why Right Ch Weak, esp Bass ?
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. |
#2
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Fisher 500-T Receiver, Why Right Ch Weak, esp Bass ?
wrote in message oups.com... 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. Just a wild guess. The electrolytic DC blocking capacitor on the "ground side" of the negative feedback voltage divider has dried up. You could re-cap the whole amp, but I'm betting that replacing the one from the right channel and its counterpart in the left channel will make a huge improvement. |
#3
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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. |
#4
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HELP: Fisher 500-T Receiver, Why Right Ch Weak, esp Bass ?
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