RE: [TCML] Burn Through The Stem Of The Globe?

["Mark R Dunn" <teslamark@xxxxxxxxxxxxx>]

Guys:

I've burnt thru a 4" decorator light bulb, but never had a problem with the
12" or 14" globes which as Scott indicated are heavy wall construction.  I
use IRF630 and IRF740 MOSFETS without difficulty.  Over the past year I have
been testing an IRFP450 which can handle substantially higher current.

Tests on my power supplies using standard old (pre 1968)TV flybacks
indicates that I can achieve 20 to 25 kV, but only about 500 uA, nothing
close to the 2 mA that Antonio reported.  I can get to 1.5 mA, but only at 5
to 7 kV.  I've wound my own flyback on a huge 4" by 1" cross-section pair of
ferrite C cores and with that I can push to near 2 mA at 20 kV, but I do not
intend to use that on a plasma globe.

Steve Ward burned thru a 12" globe, but he did it by powering the globe with
a Tesla Coil.  Even at that the pin hole was so small that it took a week
for the vacuum to be lost.

Mark

>snip 

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