Re: EL or PL509 as an audio output valve.
G8HQP Dave, thank you for answering my question; the 'why' of a design is not always obvious from a circuit diagram.
Ref the anode cap. There were[are?] some close fitting insulated covers around when I used the PL509s. I too, have brushed my hand against the PL509 top cap in a TV - big ouch, lesson learned.
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