All wikipedia content requires a valid citation  There is no validity in the common sense claim because things dont always follow common sense  All of the tubes listed in the paragraph claiming low output were specifically designed to give rasonable output at low voltages  One the L is capable of managing  watts with a plate voltage of just  volts when the bias is properly adjusted  Oddly and because of the tetrode characteristics it actually rises to  watts at  volts  You cannot claim that is significantly lower than it maximum rated output of  watts  None of the tubes listed will turn in less than  watts at  volts Article ammended accordingly