[Elecraft] KPA-500 Line-Voltage Issues

[Victor Rosenthal 4X6GP]

I had to add a soft-start relay to my Astron RS-70A power supply to keep 
it from popping a 16a breaker when using it on 50 Hz. But otherwise it 
works fine with the transformer wired for 240v.

73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/

On 07-Jul-2022 01:01, Josh Fiden wrote:
> Transformer core can saturate if line frequency is too low. Except
> I’d be certain KPA-500 uses the same transformer for export to 50Hz
> countries so your variations are fine.
> 
> Many years ago when I was young & dumb discovered this the hard way.
> Customers would take products with 120v/60Hz line xfrs and run them
> in Europe 240V/50Hz with a step-down transformer. They would
> saturate, overheat & pop fuses.
> 
> 73, Josh W6XU
> 
> Sent from my mobile device
> 
>> On Jul 6, 2022, at 12:51 PM, Dick Bingham <dick.bingham at gmail.com>
>> wrote:
>> 
>> Greetings everyone
>> 
>> I hesitate to use my KPA-500 here at this CN98pi QTH. LIne
>> frequency here varies daily between 58.xx-to-61.yy Hz
> 
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