Usually I hate myself for accepting to repair audio equipment. This was no exception but the repair was easy nevertheless.
The glue used to hold components and PCBs in place becomes conductive over time, from a few hundreds of kiloOhms to MegaOhms. This causes the preamplifier circuit to behave you will see in this video, completely random noises.
Remove all the dark brown glue and use some hot glue or similar to fix the boards and the problem is gone.
Also check all solder joints on the power amp PCB, some components get pretty hot...
Негізгі бет SUB-TS15 making strange noises - easy repair
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