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Original poster: "Matt S. by way of Terry Fritz <twftesla-at-uswest-dot-net>" <matt777777-at-hotmail-dot-com>
I am finally to the point where I have fired my gap for the first time on my
soon to be completed coil and I have a few questions.
I have a multi-segment gap composed of 9 sections (8 gaps) of 1" cu pipe
laid out horizontally on a slab of G-10 (fan and enclosure to come later).
1. I have a 12kv/60ma NST and for now I have the total spacing somewhere
around 0.200" (no, not to three significant digits, .. I'm lucky if it's +/-
30% .. setting the spacing with my feeler gage was much harder than I
anticipated for some reason).... anyway, as I ramp up the voltage, it seems
to hum in a really constant way.... but when I dial it down, it has more
of a raspy (but for some reason more appealing) sound to it. I was
wondering if I need to have my gap spacing set to a minimum in order to tune
my coil, and/or is 0.2" appropriate. ... and is the sound of it any
indication (of anything)?
2. As I dial up the voltage, before the gap fires, I hear the usual 60hz (B
flat) hum, but I also hear another (higher) audible frequency superimposed
that increases in pitch as the voltage increases and 'flattens out' (ie.
pitch doesn't change any more) a little below the voltage that the gap fires
I'm guessing that this is not really related to the gap at all, and is
probably a H.V./corona related thing, .. but I am curious about it and am
trying to figure out what the sound actually is and was wondering if someone
could comment in it.
Thanks a lot,
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