Hi Fellow audio enthusiasts,
Thought I would post this question before contacting a local Yamaha repair service as I may be able to fix it myself. I am using my fathers vintage YAMAHA CR1020 receiver in "PREAMP BYPASS MODE". I am just using the amp to drive some Magnapen SMGa speakers and using a different preamp.
The problem:
I turn the amp ON and everything is working great
Then about 1 min (pretty random time) later the right Channel drops in amplitude and and Freq. The bass is almost non existent and the woofer stops pumping. There is still sound coming out of the speaker, but at about 60% less volume
If I turn the amp OFF and ON the right channel will work again though this does not happen every time. It seems the amp needs some time OFF before the channel works again.
There are 3 Speaker outputs on the amp and this issues effect all 3 Speaker outputs on the right channel.
Any thoughts. I figured it would be an easy problem to diagnose for a person who is in the know.