[Techman]

Even after you've changed all the components mentioned above, you'll still have the 'buzzing', as none of the ones mentioned will be the cause of that!

It's absolutely no good whatsoever just jumping in and replacing components randomly without actually knowing why you're changing them and whether they're actually faulty in the first place, as it's been proven many times on here that it'll only lead to disaster!

Proper fault finding and an analytical and logical approach is what's needed. Firstly, the buzzing sound, is it a buzzing sound or is it more of a hum?

Is this 'buzz' or hum regardless of volume setting, ie, does it disappear when the volume control is turned right down to minimum?

It's possible you may have a bad signal ground problem at amplifier input stage, or if the 'hum' is there regardless of volume control then you could have a problem with one of the smoothing capacitors, but you MUST do proper fault finding!!