I share my KPA500 with a K3 and a KX3. When I want to operate JT65 or JT9 I 
normally run about 25 watts out, using the KX3 to drive the amp. With the KX3 
set to 1.8 watts out, the amp gives me 25; with 2.2 watts from the KX3, I get 
30 watts out from the amp. 

But, what if I want to run 20 watts? Or 15? When I back the KX3 power level 
below 1.8, the KPA500 shows zero on the LED power display. Does this mean it is 
no longer amplifying, or is it actually amplifying but not enough for the 
circuitry to determine how much?

Jim Bennett / W6JHB
Folsom, CA
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