Tubelab Simple PP – Performance
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Left channel waveform at 1W output.
Left channel spectra at 1W output. Notice that the 2nd harmonic dominates the left channel and not the right. Swapping output tubes had no affect on this, so it is likely that the resistors in the split-load phase splitter are not well matched. The higher order harmonics can be ignored as these are an artifact of the signal source.
Right channel spectra at 1W output. Here the 3rd harmonic slightly dominates the 2nd, as one would expect in a PP amp.
Left channel waveform at 14.3W output, just before the onset of clipping. Note the crossover distortion in the waveform.
Left channel spectra at 14.3W output. Pretty ugly, but expected given the distortion seen in the waveform. Even harmonics are again higher than expected in the channel.
Right channel spectra at 14.3W output.
Left channel frequency response at 3W output.
