Re: 120 vs 240
Posted by
Scott Ellington on
Jan 25, 2011; 6:37pm
URL: http://elecraft.85.s1.nabble.com/120-vs-240-tp5959816p5959978.html
Don't forget about the power factor. The simple power supplies in most tube-type amplifiers have pretty low power factors. I've never measured it, but my AL-82 once blew the 15 A 240 V fuses, which suggests PF was less than about 0.7.
As the KPA-500 uses an unregulated 60 V linear supply (just like the HV supplies in the tube-type amplifiers), it probably also has a power factor in the 0.7 range, and probably draws 11-12 A at 120 V. A dedicated 20 A circuit would improve regulation.
73,
Scott K9MA
Scott Ellington
Madison, Wisconsin
USA
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