Bob,
Use a filament transformer with a secondary current rating equal to the full load current of the TR-4C as an autotransformer to raise the voltage. If you can find a single transformer with two five volt windings, you can use them in series to get 10 volts, or you could use two five volt transformers. 73, Bob AD3K From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Sunday, October 09, 2011 11:12 PM To: [email protected] Subject: [Drakelist] TR-4C Filament Voltage 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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