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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: an interesting journey posted by Alex Kitic on December 9, 2016 at 01:27:03:
"Of course, with AC the hummer pot or better the pair of matched resistors is obligatory. It also cancels most of the 1st AC harmonic, so you are left with the attenuated 2nd. In this case assuming 30kHz, the 2nd is 60kHz: high enough for me."
The situation regarding harmonics is in fact even more benign than you suggest. If the wave is mostly square, very little even-order energy is present. The largest harmonic will be the third, or in the example you used, 90kHz.
The question for me is whether nulling the amplitude of the fundamental appearing at the anode is indeed sufficient to prevent unwanted mix products being generated within the tube. I haven't tested for this, thus I won't use a switching frequency below 60 kHz and would like to go much higher.
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- Harmonics - Triode_Kingdom 15:10:35 12/10/16 (0)
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