[Elecraft] KPA1500 Power Level

[Barry Simpson]

I have had a quick look through the KPA1500 manual and could not find any
reference to running the amplifier at a lower power level than the rated
1,500w.

Can anyone comment on the implications (eg temperature, efficiency and IMD)
of running a KPA1500 at say 500w by simply reducing the drive power.

Would the power level be stable if set to 500w or would it drift upwards or
downwards during the course of an over on CW ?

Thanks

Barry Simpson  VK2BJ