The filament voltage on my TR-4C is just under 6V at the tube filament pin. The Drake AC-4 is wired for 120/240V, but the Line Voltage in New Zealand is 230V. Hence, I presume, this is the reason for lower filament voltage, and probably lower HV on the plates. I suppose this means lower electron flow and less output power (Not yet determined). The only solution that I can think of is to replace the Transformer with a 230V Primary winding (Hardly worthwhile ??). Any comments please.
Bob ZL2AAQ.
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