Yes, the KPA500 runs cool at 500 watts all day long in a RTTY contest, as designed. Ed - W0YK Bob, W1EQ, asked: > Has anybody pushed the 500 limit on RTTY with the KPA500? > > Especially in a contest. > > I noticed that the fan does accelerate when using HP on RTTY. > > Just wondering how the amp would hold up under 400-500 watts > running on RTTY.