Anyone know if you can set the dc offset on a realistic sta-2500

[dsculptor]

Hey -can't find any service manual on this unit -does anyone know if you can set bias and dc offset on these? I opened it up and found a few trimmers -but without a schematic not going to mess around. I have 31 mv on the left and 61 on the right -I think I'd like to get those down a bit? found it in the recyclables and seems to run fine -I actually like it! replace the side panels with some real walnut and all looks good.

 

[mbz]

Did not see either bias or offset adj on the 2600 but that means little.
Post a pix of the main board including any trimmers/power transistors...

 

[Lavane]

A lot, if not most Realistic amps and receivers had fixed resistors to set the DC offset. You may find two small trim pots, but those are usually for voltage balance.

 

[petehall347]

there is no provision to set offset and bias .

 

[dsculptor]

Thanks guys -Here are a few pics regardless.Do you guys think that 31mv and 61mv are acceptable or out of range, if out of range the only way to fix that is to replace some resistors?

 

[Bradbrews]

I’d just let it be. It’s a Realistic.
However, if you want a project changing resistors, or even installing a pot to adjust it, could be done.

 

[redk9258]

Wouldn't you change the differential pair to a matched set of transistors?