Audio crackling - please help!

[builtclever]

Hi all,
Can anyone help me to repair the fault that is causing the crackling sound on audio please? I have layman skills, but could possibly tackle this if given instructions.
It was my Dad's unit, so very sentimental and I'd like to keep it going.

Thanks in advance.

Clive.

 

[Hajidub]

What's the unit? Most likely needs a deoxit treatment from the interior on the selector and volume pots. Spray and work them vigorously.

 

[builtclever]

What's the unit? Most likely needs a deoxit treatment from the interior on the selector and volume pots. Spray and work them vigorously.

GF767. I sprayed all pots and switches. It's not affected or caused by knobs or slider movement, merely when the volume is turned up, whether on radio tape or input.

What's the unit? Most likely needs a deoxit treatment from the interior on the selector and volume pots. Spray and work them vigorously.