Hi, Bob - I wouldn't worry much about the 230 vs 240 V difference. Back when the Drakes were made, most line voltage in the US were assumed to be 115 VAC anyway. Since 115 is half 230 you should be spot-on. (I suspect the higher voltages we now have in the US may slightly contribute to the transformers running warmer).
I can't recall if you folks in N.Z. use 50 or 60 Hz. I found during my time working on power supplies years ago that this difference would have more of an effect on the equipment (it causes transformers rated for 60 Hz to run much warmer at 50 Hz) than a change in line voltage (within reason). I can also recall testing lots of equipment that was designed to run at least +/- 10% of rated line voltage. Tube equipment, in general, tends to be less fussy. I'd try firing it up with what you have and measuring your power out. 73, Steve, W1ES/4 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. _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
