[Elecraft] K4D - KPA500 Fault Question + wish

[john at kk9a.com]

Is there data showing more dissipated heat with lower output in solid state
amplifiers?  I have seen similar posts on the SPE Expert list. The following
KPA1500 post shows much lower efficiency with lower power but not more lost
wattage: I am not an RF amp guru, I am just trying to understand this.
http://mailman.qth.net/pipermail/elecraft/2018-August/259502.html

John KK9A



Jack Brindle W6FB wrote:

Steve;

And, like all amplifiers, the KPA500 has a design point where efficiency is
best. Outside this design point (both high and low),
efficiency will fall off and you will find that the amp will run hotter

73,
Jack, W6FB