350A amplifier analogue

[c.coyle]

I have a Sansui 350A capacitor coupled receiver. I swear the service manual says absolutely nothing about aligning the amplifier section. I'm wondering if Sansui made an integrated amp with the same amplifier section (and therefore a service manual that might help me). The 350A amp block is F-1250.

 

[Roy Skinner]

I have a 4000 manual. I wonder how similar they are.

I am really surprised you have not had several responses by now.

 

[c.coyle]

I have a 4000 manual. I wonder how similar they are.

I am really surprised you have not had several responses by now.

Thanks. I'll check out the 4000 manual on Hifi Engine. It just dawned on me that I should Google "Sansui F-1250" and see what I get.

EDIT: The answer is nothing other than the 350A

 

[chazix]

aligning the amplifier section

From the hifiengine schematic, idle current appears to be fixed, so the only power amp adjustment is for the center voltage. You could adjust for the 23V that the schematic calls for at the collectors of the "lower" output transistors. (Or if you want to be a little obsessive about it, and you have a dual-channel 'scope, you could adjust for symmetrical clipping of peaks with both channels playing program material into an eight ohm load.)

Hope this helps,

chazix

 

[c.coyle]

Thanks. That makes sense.