I'am now near completing my tubeamp project. After analysing the tube's datheets and output transformer, I conclude that the total harmonic distortion of the tube amp is expected to be many times worse than for a ss amp. Mainly because of the output transformer. The messurements will be done in the new year, than I can be 100% positive.
For most tube headpnone amps you don't need a output transformer. This probably makes quite a difference.
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