Electronics > Repair
Lenco A-50 Vintage amplifier repair question
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cvanc:
The pots look to be typical idle current adjustments.

Given the current overheating issues it might be good to set them for minimum overall current draw for the time being.  Later, once the circuit is working right, adjust the pots for the sweet spot where both distortion and current draw are reasonably low.
NoNameYet:
2016?
That makes it 8 years!  :)
Did you fix that guys?
When I was a kid I had one R50. It worked fine but I got me Yamaha surround. More or less, mistake.  :) Well, it works nice.
But vintage is another thing.
So I got me another R50 for nostalgia. Its...ok I belive it was in some basement for 20+ years I thimk. Slightly over humid.
Well it works.
There is just problem with FM. No output from the board. If I tuch outputs there is a hum. So other things work. AUX and TAPE...
I have got me a "service manual" from hifi engine. Its OK. Its just schematic have no control values voltages nothing.
I see in original post, schematic is a bit diferent and probably beter pdf than the one I got.
So! I welcome ideas about FM problems and some good schematic diagram if there is one. Thank you.  All the best! 
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