While the plasma tube is running, the spooky central makes strange beeping-like sounds.

Happens with mine. I've figured the beep beep comes from the so called gating where the device is switched on and off four times a second, by default. The sound comes when the frequency is quite in the audible range, like 2000Hz. I don't hear the low frequencies or the high ones. But then I'm old and 9.5KHz is my limit!

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