On my video, at minute 3:00 on you can see that when I just turn on the inductor, (without the Kacher), there is already a sound similar to when I turn on the Kacher. So, even without the Kacher on, there is a Radio Moscow type sound, even without the HV. One guy calls that the "fried chicken sound". Then when the Kacher is turned on, the sound intensifies. But, the frequency stays the same on the scope. Also some of the audible signal noises are actually heard "ringing" at lower harmonic frequencies compared to their source signals. As Vasik, mentions. I can't hear anything above 11.5KHz, because, I'm getting old. 69 plus...and using no hearing aids, no glasses, nor needing Viagra, as yet. However, I can hear the sweet tune from Radio Moscow... NickZ
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