Very interesting.Some progress. It works from the start. Powered by ~59VDC, with sine output ~960mVpkpk, 327mVrms, it has distortion 0.063%, likely better since my supply is not the best at the moment.
Personaly I detect 2nd harmonic at 0,63% and 3rd at 0,22% during an extensive test of sensitivity of different distortion components.
You are very close to that relationship but a magnitude lower so I suspect that it can handle some complex music too before being noticed as colouration.
Hope for a very neutral, musical and transparent sound character with that harmonic distortion pattern.
Will follow your progress...
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I do not plan other experiments, its installed in the box playing beautifuly. Its clean and musical.
0.6% distortion may be confusing on complex music. That reminds me when i started my experiments with hamtone pre. Its ideal as mic preamp for one voice. But as for complex music its too much distortion. Some hamptones depending on the jfet i used got very clean and great sounding down to 0.02%. Worth exploring.
0.6% distortion may be confusing on complex music. That reminds me when i started my experiments with hamtone pre. Its ideal as mic preamp for one voice. But as for complex music its too much distortion. Some hamptones depending on the jfet i used got very clean and great sounding down to 0.02%. Worth exploring.