Repair Shop in Southern California

Thank you guys.

The click is from amp and only noticeable when not playing music. I did some web research and most ppl say it is related to protection circuit been activated.  They are old amps but I just love them.    

Good advise MB. Just checked cables and cords and they all looked fine. I guess I will bring the to gm AV. Bought them in 85 and no issues until now. I have a newer type of receiver (the AV stuff) but it does not produce same quality of sound on the same set of speakers. The old mitsu are way clean and solid IMO.

Thank you guys. I guess I need to do more research.

Will do.

Not yet papa. Will call weekend. 

Called GMAV and NE. Both have $75 minimum charge. Talked to Tom of NE and he gave me a few simple steps to isolate the source of noise and I was able to determine it's power amp. Tom did say that he cannot resolve the problem if clicks are from the preamp because parts for a specific board are no longer available. At this point I feel Tom knows exactly what's going on so I will make an appointment with him next week.

GMAV was very professional and courteous (I think it is a much larger business comparing to NE) but I could not talk to technicians. From the web site, they are very good in high end stuff. Seems like an overkill for my old Mitsus.

Really appreciate you guys and will let you know how it goes.