Hi...
I have a Sansui A-80 amplifier, and the right channel sound with less treble than the left channel, Which I should suspect that's wrong with him?
Thanks a lot for the help
I have a Sansui A-80 amplifier, and the right channel sound with less treble than the left channel, Which I should suspect that's wrong with him?
Thanks a lot for the help
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Joined 2009
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You probably tried this already - but make sure first, that it isn't the source. Swap the input cables L and R with each other and see if the problem follows the cables or stays with the amp.
And then also make sure it isn't the speakers. Swap the speakers around L and R and see if the problem follows the speaker.
Try cleaning the connectors between the source and the amp, and the speaker cables too.
And then also make sure it isn't the speakers. Swap the speakers around L and R and see if the problem follows the speaker.
Try cleaning the connectors between the source and the amp, and the speaker cables too.
Yes, I have the amplifier since 1981, I've tried several speakers, and swapped the speakers and input cables, and in fact the problem is the amplifier ...
Hi Dan,
Do your tone controls make any difference? Loudness control?
Having one channel with frequency response problems with the high notes is an odd problem. If those two things don't make any difference, then forget everything you have done and start fresh as if you just walked into a friends place to find he is having this problem.
Do not assume anything and write down only things you witness. Remember, no assumptions!
-Chris
Do your tone controls make any difference? Loudness control?
Having one channel with frequency response problems with the high notes is an odd problem. If those two things don't make any difference, then forget everything you have done and start fresh as if you just walked into a friends place to find he is having this problem.
Do not assume anything and write down only things you witness. Remember, no assumptions!
-Chris
Yes, it could be a bad switch, pot, etc. A scope and signal generator would be a big help in fixing a problem like this.
Hi rayma,
It also helps to be observant and milk the controls and switches for all the information you can get. Operate the controls slowly so that you can determine if any are not making good connections.
Absolutely, a scope, audio generator, speakers and ears would make this a lot easier.
-Chris
It also helps to be observant and milk the controls and switches for all the information you can get. Operate the controls slowly so that you can determine if any are not making good connections.
Absolutely, a scope, audio generator, speakers and ears would make this a lot easier.
-Chris
Right now I have an old Pioneer receiver with a volume control that cuts in and out depending on how the control is rotated.
I'm not anxious to replace that one.
There are lots of small caps, and some are even used for local feedback in the power amplifier output stage, where temperatures tend to highest. 1981 is 34 years ago and I would not only think that recapping was overdue but I would be at least be looking at a few of those caps with suspicion, starting with those like C49/50 that will likely affect frequency response.
Sansui A-80 Manual - Stereo Integrated DC Servo Amplifier - HiFi Engine
Sansui A-80 Manual - Stereo Integrated DC Servo Amplifier - HiFi Engine
Apologies, I had intended to say bootstrap but thought better of it. 'Seems I just confused matters.
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