Problem with Nakamichi PA-7

[CptFuture]

Hi all
My Nakamichi PA-7 poweramp (first version, not the MK2), has a very strange problem after turning OFF:
After turning OFF, I hear clicking the two relais, everything seems ok. But after some seconds, the clipping LED of the right channel goes on. It stays on for about 20 seconds and then turns off very very slowly.
What could be the cause of that? Any comments are very welcome.
Regards from Switzerland.
Andy

 

[Osvaldo de Banfield]

The amplifier may have too much offset because a degraded semiconductor or faulty caps and o resistors. I would try to recap entirely if it is over ten years old.