[Elecraft] KPA-1500 SWR fault above 700-800 watts on 160m

[Ken Ramirez de Arellano]

Every bit of antenna hardware ( coax, balun, insulators, etc. have been
changed out or proven good. Connections are all solid.  My KPA1500 will
transmit above 800 watts for about 15-30 seconds and then the SWR jumps up
and it faults out for high VSWR.  I can run 1500 watts on all the other
“Legacy” bands (10,15,20,40,80) with no problems. I’ve forced an STU
relearn and still the same issue. The antenna B amp is a Clipperton L and
that transmits at a KW out and I see no change in VSWR in the external
wattmeter using all of the same cabling. It’s starting to look like
something heating up in the KPA1500. Is anyone aware of a known issue for
this with the KPA1500 or a known fix? I would rather do a field repair
instead of sending to Elecraft from KP4.  TIA Ken, KP3MM
-- 
Ken Ramirez
KP3MM