EL34s are supposed to be happy with a screen voltage up to ~ 420v but they can, of course, be run with lower screen voltage than that. Some people believe that power pentodes sound better at reduced screen voltage but I've never seen any convincing argument as to why that should be so.
I'm wondering, in the case of EL34s in pentode PP Class AB1, with B+ of 420v, whether there is anything to be gained by using a lower screen supply voltage and, if so, what sort of voltage and why? Anybody have any thoughts on this?
I'm wondering, in the case of EL34s in pentode PP Class AB1, with B+ of 420v, whether there is anything to be gained by using a lower screen supply voltage and, if so, what sort of voltage and why? Anybody have any thoughts on this?