[Elecraft] KPA500 HV concerns

[Ron W3ZV]

I am running my KPA 500 on 120v. My actual line voltage is about 122v. I am using the yellow tap. HV with the amp in standby is about 73 volts. With power set to deliver 400W rtty, the voltage drops to about 58v. My reading of the manual indicates that the amp might start to be less than a good neighbor at that voltage.

Without checking, I would guess that using another tap would set the standby HV higher than recommended.

Are my concerns justified, and is the only answer decreasing power until the voltage sag reaches an acceptable level?

Ron W3ZV