Bob, If you feel that the voltage are too low for you, find an old cheap 3 to 4 amp car battery charger (typically 24 volt center tapped for 12 volt battery). Then wire the transformer with the primary on the 230 volts, and the secondary boosting that voltage. Assume 230, plus a 12 volt (half of secondary) gives you 242 volts. 1% over voltage vs 10% under voltage.
Basically, you need a transformer for boosting, which has a secondary current rating of the full load of the Drake transformer. If I recall correctly that is about 4ish amps on 240 Volts. Since you are not at full load all the time, a little under rated will work. Don't be running RTTY or other high demand modes with an under rated transformer though. This is making an auto-transformer. This idea is being used a lot with old broadcast receiver "protectors". Those radios were made in a day when 105-110 volts were normal in the US, vs the 120-125 volts common today. The idea in this case is to "buck" the input voltage to a lower value. Good luck, and let us know what you decide and what your results are. 73, Ron WD8SBB --- On Sun, 10/9/11, [email protected] <[email protected]> wrote: From: [email protected] <[email protected]> Subject: [Drakelist] TR-4C Filament Voltage To: [email protected] Date: Sunday, October 9, 2011, 11:12 PM 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. -----Inline Attachment Follows----- _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
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