can you recomend a new set of vaves for my c5 01? also, do i need to have the amp biased when changing the el84? thanks.
If you contact firstname.lastname@example.org they will be able to advise on new valves and re-biasing of your amplifier.
Try tubedoctor.com for valves. They sell a Class 5 set in different versions.
Class 5 amps do not need to be rebiased.