dc offset in realistic sa-2001

[craig elder]

Greetings all,
How do you set the dc offset in this amplifier? There isn't a variable resistor to make adjustments. It has one for the idling current only. The schematic is useless.

 

[Lavane]

If I remember right, you don't. It's set with fixed resistors like a lot of Realistic amplifiers and receivers. How many milivolts at the speaker terminals with volume down, no signal?

 

[jheu02]

Oftentimes, you can find a resistor feeding the differential pair and rig a trimmer to replace it, giving you some control. Here's what I did for a Scott A-436.... Last post

https://audiokarma.org/forums/index.php?threads/scott-a-436-restoration.782867/

 

[craig elder]

If I remember right, you don't. It's set with fixed resistors like a lot of Realistic amplifiers and receivers. How many milivolts at the speaker terminals with volume down, no signal?

thanks for the info. i will let you know when i get that far. i was just exploring the circuits. I have to rebuild it.

 

[craig elder]

can you adjust the resistors value if the the dc is too high?

 

[Lavane]

I guess you could. But if it's around 30mv or less I wouldn't worry about it.