Re: [TCML] Tube choice for a VTTC 350khz?

[Frosty <frosty90@xxxxxxxxx>]

Regarding the sword like sparks, I've found with my solid state coils, the
spark appearance dosen't seem to depend on the actual resonant frequency,
(my small coil runs at about 350khz and my larger one below 200khz, and both
can give sword like sparks). From what I've found, simply through
experimentation, the spark appearance seems to depend mostly on how you
modulate the rf. (since tube coils and solid state coild both operate
similarly in terms of wave forms, I think what applies to SSTCs will apply
essentially to VTTCs as well). I've found that half wave rectified supply,
or any other smooth low frequency envelope produces the straight sparks,
regardless of the resonant frequency. Rapidly changing envelopes seem to
give jagged sparks, and the shorter the pulses, the louder and more jagged
they seem to get. Higher audio freqency (above about 200hz ) modulation
seems to give bushy sprarks.

The sound of the sparks changes suprisingly with modulation as well. A
single pulse of half wave rectified pulse make a singe long sword spark, and
a very plesant dull thud/ popping sound, but not loud, yet a spark of the
same physical size, but a short square pulse of modulation, is VERY loud.

An interesting thing to try would be to power a small tube or solid state
coil from the output of a big audio amp (I have tried this on a small low
power SSTC once), and observe the different spark formations with different
signals in.


Cheers,
Jesse
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