all wikipedia content requires a valid citation there is no validity in the 'common sense' claim because things don't 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