Sansui au-555 output adjustment

[quadmatrix82]

hi sansui experts, just wondering if there is a known method to perform an output adjustment on a sansui au-555 without using a scope? There is a method described here for the au-555a but not sansui au-555? Thanks!

 

[Hyperion]

Do you mean the centre voltage adjustment? - simply adjust so that the centre voltage is exactly half the rail voltage is my understanding.

 

[quadmatrix82]

if I refer to the service manual I meant the main amp section output adjustment - what's the best way to do this without a scope?

 

[Hyperion]

if I refer to the service manual I meant the main amp section output adjustment - what's the best way to do this without a scope?

Well, if you mean the adjustment that mentions 'clipping' there is no other way as far as I know - apart from setting the centre voltage.

Let one of the AU-555 experts advise you, as I have never set one up I may not be the best person to advise you on this.

 

[quadmatrix82]

Ok thanks I'm familiar with the process for the 555a to set the centre voltage is it the same for the 555? I presume to circa 27v off the coupling cap?

 

[stereofun]

Yes, same on the 555. Set at coupling caps to half of what you measured at the supply cap.

 

[Sprungtol]

Hi
Last month my sansui AU 555 broke on left channel.
So i had it fixed by local service shop.
The result is bad.
The treble is way too sibilance and the bass got no adequate punch.
Any idea why this happens ?
Thank you in advance

 

[quadmatrix82]

Best you start a new thread could be anything!