[Elecraft] [Kpa500] voltage tap

[eric norris]

My KPA500 used to be on a 220v line, but it is now in an area where that is not possible.  It is on 120v, in a 65 year old house.  Further, I am running it on a 10ft appliance type heavy extension cord.  I cannot change these circumstances for the forseeable future.
No load HV is 78v.  Under full (550w on 40m) load it is 60v.  Current tap is RED.  Should I go GREEN?  Should I leave it on RED?  How much HV boost would that give?  Good/bad/disasterous idea?
73 Eric WD6DBM

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