Hello anyone who is experienced with Sansui's 5000A receiver I would a appreciate your help with a few problems.
When turned on and going from off to speaker A there is a large popping sound from the speakers. This even occurs after letting the receiver warm up for 5 plus minutes.
The other issue is there is also a low frequency buzzing noise coming from both channels that doesn't increase with increases in volume and tends to decrease in it's intensity one the unit warms up. But it is always there in the background none the less!
Now I have checked the PS voltage across the filter caps and it is 76.5 Vdc in the left channel and 76 Vdc in the right, which are both within the factory spec of 77Vdc. I also set the bias of both channels with 8 ohm/200w dummy loads to Sansui spec of 23uA and checked DC leakage which was almost nil.
So any guidance for troubleshooting these problems would be appreciated