Transformer hum is my only problem but this reduces after a while but remains at low level    . I have searched all posts and see reference to repair handbooks and capacitor kits, are they still obtainable and how do I go about getting them?  Total system still good after all this time (1986) so I am reluctant to get rid of. Any advice would be welcome.

Thanks in advance

Neville C

A common problem with transfomers is hardening of the rubber bushes with which the transformer is mounted. Every transfomer has a bit of hum, but the bushes make sure that the humming won't get through to the cabinet. I would first check the rubber bushes.