[Elecraft] KPA 500 voltage drop on key down

[Harry Yingst]

Is the amp running off of 240?
The amp does draw quite a bit and really works best on 240


      From: Matt Murphy <matt at nq6n.com>
 To: Elecraft Reflector <elecraft at mailman.qth.net> 
 Sent: Friday, November 20, 2015 10:45 AM
 Subject: [Elecraft] KPA 500 voltage drop on key down
   
I just set up my KPA 500 and the HV on standby is 72.5 volts.  On key down,
however, it drops to 48 volts and the lights in the shack noticeably
flicker a bit.

Would changing a the tap on the transformer potentially help things? Or is
the real issue the voltage drop between the pole and the wall socket?

Suggestions/ideas would be much appreciated, as well as tips for debugging
any issues with the household wiring.

Per the KPA 500 manual, the amp may fault if the voltage under load gets
below 60VDC, so running in it with reduced drive may be necessary. While
doing that wouldn't be the end of the world, I'd like to address the root
cause if possible.

73,
Matt NQ6N
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