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Sansui AU-101 / High Pitched sound with loudness turned on

S

skywatcherr

New Member
Dear All,

I have just received my Sansui AU-101 today in really good cosmetic condition (well chuffed), and fired it up with Wharfedale Denton 80th Anniversary addition speakers (6 ohm suitable for 20w - 100w amps per manufacturers recommendation).

However, with loudness turned on, if I turn the bass dial beyond 0 or turn the volume up beyond level 4, it creates that high-pitched sound as if when your mic is too closed to your speakers, like a loud boom in the room. Could someone help me out what could be the case, is it the speakers being too heavy or are we talking something wrong with the amp?

With loudness on, it produces sweet warm sound till up to volume level 4, and with loudness off, I can turn it up more. With loudness on, if I turn the bass all the way to + same boom / high-pitched noise starts again.

Many thanks in advance for your help.
 
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My guess is 15 watt amp into 8ohm powering 86dB 6ohm speakers could be an issue

You also mention it's in good cosmetic condition what's the condition of the amp itself? original or has it been restored? if original the 45 + year old internals might be acting up on you too.
 
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Dswankey said:
My guess is 15 watt amp into 8ohm powering 86dB 6ohm speakers is the issue

You also mention it's in good cosmetic condition what's the condition of the amp itself? original or has it been restored? if original the 45 + year old internals might be acting up on you too.
Click to expand...

Thanks Dswankey, I haven't opened it so no idea if it has been restored or not. I'll try to do that tomorrow.

I don't have any other speakers so not sure how I can check. I have been googling, and it appears that loudness should really be used at lower volumes - which makes sense, but I just want to know if that amount of feedback is normal.
 
The feedback is not normal and more then likely is something in the amps internal not working correctly
 
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