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Old 10th August 2009, 03:04 PM   #1
hew128 is offline hew128  Singapore
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Default Setting bias on Sansui AU4400

Hi,

I have a Sansui AU4400 which was just repaired by the shop. He fixed my 'crackling' sound on the left channel but did not have the service manual to reset the bias afterwards.

Can anyone help with the details? Thanks!
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Old 10th August 2009, 03:20 PM   #2
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With my designs I start off with zero bias and slowly wind it up until crossver distortion goes. You need to have a speaker connected to do this. Yo ualso need a sigan generator and a scope.

There seems to be an obsession with some designers to make extra current go through the output pairs but this is just wasted as heat.

So long as there is no crossover distortion in normal use the setting is fine.
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Old 25th November 2009, 02:51 AM   #3
hew128 is offline hew128  Singapore
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Discovered one channel was set to about 49mV and the other about 15mv. I have since set both channels to about 15mV and seem to be working fine.

Replaced all electrolytics except for the large 2200uF 50V. So far excellent results and sounds like a tube amp!!!
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Old 28th December 2011, 07:32 PM   #4
Maros is offline Maros  Netherlands
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Well, just for other folks with cracking speakers with the Sansui AU-4400 : check your fuses, and their connections to the board.
Check continuity whit yer' meter on the beep-mode, and if it doesn't beep, the fuse or connection is bad.
Replace the fuse or bow the fuse holder a slight bit inner wards.
Well, this learned my Sansui not to grumble
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Old 28th December 2011, 10:10 PM   #5
amptech is offline amptech  Scotland
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Quote:
Originally Posted by hew128 View Post
Discovered one channel was set to about 49mV and the other about 15mv. I have since set both channels to about 15mV and seem to be working fine.

Replaced all electrolytics except for the large 2200uF 50V. So far excellent results and sounds like a tube amp!!!

Rule of thumb would have been to use the working side to set up the bias.. that's been done..and all is well
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