[Amps] Heater voltage

[Steve Thompson <g8gsq@eltac.co.uk>]

Thinking of valves with oxide cathodes (8877, 4CX1000A etc.) is there a 
particular reason why Eimac went for low voltage high current? It seems 
to me that chokes, wiring, offboard psus would be easier if we were 
dealing with 20V 2.5A instead of 5V 10A.

Steve
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