Good advices for a newbie (threading tools lathe)

[PJs]

Congratulations Stefano, you have successfully modulated plasma with audio!! A big feat! Couple of observations/questions.

Did you feed your tape directly to the grid of the tube? What is the output level of the tape in volts?

There was a definite clipping at several points in the video. Not sure what you were doing at the time with the controls but a few of them felt/sounded like a low frequency ground pounding clip...Ground noise build up through a cap?

Do you have any way to feed a frequency generator sweep into it with a constant output voltage?

Baby steps now...to dial it in.

Terrific! ~PJ