I have one of these that seems to work fine, but it requires about 10 watts of dead key to fire(TX) anything below that it will not TX and close to 10 watts the relay will chatter on voice peaks. This seems high, but that amp functions fine and sounds fine on the air. I feel like somebody modded this amp, or there is a component on the input that is acting like a dummy load. Even still my input tune is good. Anyone got any suggestions to look anywhere in particular.