Re: bargain or dead bird? (fwd)
---------- Forwarded message ----------
Date: Sun, 18 Jan 98 13:40:10 -0500
From: Adam <absmith-at-tiac-dot-net>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: bargain or dead bird? (fwd)
>as new coiler I just broke down my first coil which gave me 12-15"
>streamers from a 15 KV 30 mA NST, 24 windings primairy, 0.02 uF C(prim)
>Leyden jars and 13 pF top cap with a 2290 windings, 4.33" diam/ 33.7"
>lenght sec coilform. Way out of tune but startling results for me as
Your capacitor is too big for the transformer you are using. Your cap is
probably not charging to its full potential, and may be inhibiting the
maximum performance possible from your system. 0.005 uF is the most you
can theoretically charge with a 15kAV 30mA transformer. I little bit
more or less is fine, but 0.02 is definitely too much. Losing some of
the capacitor will allow you tune this small coil using a lot more of
your 24 turn primary.
>kitchen (is this what they call 'flashing alu' ???). For higher voltage
Aluminum flashing comes in rolls from a hardware or building supply
store. It is used around roofs and windows, and is much thicker than
>I was offered tens of NST 8000 V varying from 30-50 mA for 13 U$ each
That's a pretty good deal. Those will work fine in parallel. Take the
50mA units first!
>only. What about cascading them for higher voltage and switching them in
>parallel for higher current?
Parallel is the only sensible way to connect them. The insulation is not
designed to survive a continuous two-times overvoltage condition.
>Isn't it so that when firing a coil in different place with different
>max. poweroutput of the partcular walloutlet and thus different settings
>of the variac->
>4)THE CAPS and GAPS ALWAYS SHOULD BE READJUSTED WITH DIFF.
If you plan to run/tune at low power, you may need to decrease the
distance of the main gap *unless* you have resonance between the neon
transformer and tank capacitor in which case it may not be necessary. It
will still run smoother if you do shorten the gap, which I would
>the static gaps described as build up with pvc tubes: are they just a
>PVC tube with several pieces of copper tubing stack up in a row through
>the pvc tube and
>5)ONLY USE THE FIRST AND THE LAST PIECE OF COPPER TO CONNECT THE GAP?
No. Use any combination you need to get the best gap setting. You
connect the first and last pipe to the tank, and use short heavy duty
jumpers to short out gap(s) from the whole.
>6) AND IS THE ALWAYS DESCRIBED FAN JUST BLOWING THROUGH THE PIPE TO
The fan mainly just clears ionized air from the gap. If ions build up,
the spark will shorten noticeably. This does help quenching.
>7) CAN I SIMPLE ADJUST GAPLENGTH BY CONNECTING 1 SIDE OF THE GAP TO THE
>FIRSTLAST OR SECONDLAST (ETC) COPPERPIECE?