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Thread: NAD 7100 preamp/tuner/amp Fading problem |
    
New member Username: Babahu
Post Number: 1
Registered: Sep-07
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| Posted on Wednesday, September 26, 2007 - 11:34 pm: |
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NAD 7100 preamp/tuner/amp
Suddenly the balance changes, or perhaps one channel gets lower. Sometimes some popply or scratchy noise but mostly the image moves left or right... occasionally, then it settles down for a while, then again.
I assume some volume control circuit is messing up? Any fix? Any suggestions? |
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Gold Member Username: Nuck
Post Number: 8777
Registered: Dec-04
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| Posted on Thursday, September 27, 2007 - 06:30 am: |
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Hugh, does this happen only with the tuner? Do you have another source to try, a cdp perhaps?
Have you tried another input to the preamp, or switched interconnects around?
Have you serviced or replaced speaker leads in recent memory? |
New member Username: Babahu
Post Number: 2
Registered: Sep-07
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| Posted on Thursday, September 27, 2007 - 04:52 pm: |
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It happens with tape or cd input. I suspect the preamp section. Speaker leads are old but I wiggled them to no effect. It seems more temperature, corrosion, or capacitors in some kind of volume/balance circuit. Tapping the circuit board and wiggling gives no output noises.
Switched interconnects to no effect.
The manual mentions "feedback controlled volume control" or some such. Perhaps this circuit is failing and muting the output. Know anything about this feature? |
Gold Member Username: Nuck
Post Number: 8778
Registered: Dec-04
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| Posted on Thursday, September 27, 2007 - 05:10 pm: |
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Sorry, Hugh, but no.
I know recaps are not very expensive though. |
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