Need TSG help

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Original poster: "S & J Young by way of Terry Fritz <twftesla-at-qwest-dot-net>" <youngs-at-konnections-dot-net>

To TSG Engineers & experimenters,

I need some advice.  I have a 15 KV DC supply which charges a series
connected primary LC tank circuit via one spark gap, then discharges the
tank LC via a second spark gap.  Basically, it is a SPDT switch.  The RSG
version of that I call the Deanogap which I have described in previous
posts.  It works really well and no power wasting series resistor or other
ballast is needed.

I tried replacing the RSG with two TSGs, alternately fired by two HEI coils.
Each TSG is three copper pipe couplings, with the trigger applied to the
center one through 5 .001 mF 10 KV caps in series.  The center electrode is
biased at mid-voltage by resistor strings.  The circuit is +7.5 KV to one
TSG and - 7.5 KV to the other TSG.  The other ends of the TSGs are connected
together and to the tank cap.  The other end of the tank cap connects to the
primary.  Finally, the other end of the primary goes to the -7.5 KV.

Here is the problem.  When one of the TSGs fires, it immediately causes the
2nd one to fire.  Both of them firing at once is really bad news!  It
results in a deafening, frightening BANG!! as several hundred Joules of
reservoir cap energy is discharged through the two TSGs in series!  Very
hard on caps, power supply and my nerves, and no energy makes it to the
secondary.

I suspect it will be difficult to impossible to prevent this from happening,
but I thought I would try the wisdom of the list before abandoning the
design.  Any ideas on how to prevent each TSG from causing the other one to
simultaneously fire?

--Steve