WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
Building, troubleshooting and testing of these amplifiers should only be
performed by someone who is thoroughly familiar with
the safety precautions around high voltages.
What are the best places to buy componants for restoring old equipment?
As per a previous thread I have an old SP8 that looks to need some new capasitors for the power supply etc., but I didn't seem to be able to find anything via google yeasterday...
Did you try the usual British surces like Farnell? They would have suitable caps, resistors, and the like. For specialized tube items, there's Parts Connexion.