Original poster: "Mark Hales by way of Terry Fritz <twftesla-at-qwest-dot-net>" <markhals-at-dircon.co.uk> Many thanks Matt... Mark. > Yes, > The PL509 is equivalent to the 40KG6A and therefore has a 40-volt filament. It > is otherwise operationally equivalent to the 6KG6A/EL509 usually used as a > class A amplifier or horiz. deflection Amp. in color TVs. > Matt D. > >