"The maximum frequency of Spooky2 Plasma is about 3.6 MHz, but again this depends on many factors like the length, spacing and orientation of the white wires feeding the tube, tube type and more. Adding a high speed gate (about 20 Hz) increases the operation range. We have run a Spooky2 Plasma at 8 MHz using a short wire and 20 Hz gating." I think this can help a bit if you're worried about damaging Plasma.
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