Modified Valve Junior head putting out about exactly 5W into a 16-ohm dummy load, right on the edge of hard (square-wave) clipping. Notice the enormous amount of 2nd-order harmonic distortion on the waveform. Flat-out, the amp can produce a 11.5Vrms square-wave into a 16-ohm load, for about 8.2W in really nasty distortion.

Modified Valve Junior head putting out about exactly 5W into a 16-ohm dummy load, right on the edge of hard (square-wave) clipping. Notice the enormous amount of 2nd-order harmonic distortion on the waveform. Flat-out, the amp can produce a 11.5Vrms square-wave into a 16-ohm load, for about 8.2W in really nasty distortion.