there is still a humming from the Loudspeaker left and right.
I want to get rid of it and I am looking for helping information.
Hum hunting can be frustrating. You have to be methodical. 3 basic methods to find most hums:
1. Simplify: Try the amp with just speakers alone, everything else disconnected. If it hums, get the amp repaired. If it is not humming then add the preamp alone with nothing else connected to it. Plug all components into the same electrical circuit (on the same circuit breaker or same extension cord.) Keep adding components until you find the hum. If you use tube equipment, replace or swap tubes methodically in the humming component before sending for repair.
2. Power: Tighten all screw terminals and wire nuts on all switches and outlets on the audio power circuit. Just one loose screw or wire nut on any shared circuit adds resistance which causes hum in audio equipment. Terminals on outlets in exterior walls come loose due to temperature cycles over the years. Even if you use dedicated circuit, the connections must all be tight to avoid problems.
3. External ground: Disconnect any external signal cables like cable TV or FM radio antenna coax cable. If that stops hum then use this:
https://www.jensen-transformers.com/product/vrd-1ff/Good luck and welcome to AudioCircle, Dante!
