Further to my earlier note about driving the KPA500 with the KX3 on 6 meters, I've done some more experimenting, and find that since the KX3 is incapable of overdriving the amp, it's best to disable the KX3 ALC. With this done, 8 watts CW from the KX3 produces 210 watts output from the KPA500, which is loafing at this power level. 73 Ray W2RS