[Elecraft] 120 vs 240

[Scott Ellington]

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