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Luxman R-1050, no DC offser adjustment?

Raynald

Raynald

Addicted Member
Luxman R-1050, no DC offset adjustment?

I managed to get the bias current pretty much spot on 50ma. Checked the DC offset and it is around 65mv and 75mv. Not dangerous but not great.

There does not seem to be any way to adjust it. Any advice?
 
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Yeah, no offset adjustment on this unit. Just to expand on Glenn's comment, you will want to replace the differential amplifier transistors with closely hFE (beta) matched pairs in each channel. The transistor pairings are Q101a/Q102a and Q101b/Q102b (the way Glenn wrote them may be a little confusing).
 
Let it run for a while, same results. At least it is stable.

Just testing it now on FM with a very small pair of PSB Alpha Mites. Sounds VERY good as is, I can understand the appeal of this series.
 
That offset will seriously degrade the overall "pleasantness" of the output. Over 50mV sounds harsh and unpleasant to my awesome ears. ;)
 
After 10 years it is probably fixed or he has moved on. I'm dealing with the same issue for this receiver on another thread. So I'll check that out too. Thanks.
 
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