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No offense but I know the model #is not the output dude, I've been in radio since 1977 I can look at the theoretical output (80 watt transistor) times four and subtract according to duty cycle to keep heat at a minimum. If this box has MRF455's they are 60 watt transistors the MRF 454 is 80 watt's, both of these are obsolete, and now? I don't know if I'm gonna keep it. I have MS so my memory has good days and some not.