Battling with an '80 radio/tape.

[boater sam]

Thanks to Jeffrey and David the problem is solved, its all working normally.

I cleaned all the switches and both pots, replaced 3 capacitors around the volume and tone controls and it worked.
The capacitors were off spec, leaking a bit and I suspect were passing a bit of DC into the amp chip.
These radios with little but the odd chip in them are not my scene but I felt that this one was worth saving. It cost very little to buy or repair.
They do however perform amazingly well, the FM quality on this one is astounding even with the aerial fully collapsed.

Thanks again for the help guys,

Sam.