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RE: Really big VTTCs

Original poster: "Cameron B. Prince" <cplists@xxxxxxxxxxxxxxxxx>

John Freau actually achieved 38" sparks with him potential transformer
driven VTTC with 3 833A's on a 60A circuit. As far as I know, this is the

I did hit the 37" mark with my v7 coil but this was at an extremely low
pulse rate and popped the 20A breaker too much to be worthwhile.


> -----Original Message-----
> From: Tesla list [mailto:tesla@xxxxxxxxxx]
> Sent: Monday, January 22, 2007 9:26 PM
> To: tesla@xxxxxxxxxx
> Subject: R: Really big VTTCs
> Original poster: "Vladimiro Mazzilli" <V.Mazzilli@xxxxxxx>
> I know too the 36" spark 4X833 John Freau's Vttc,
> So I have heard many times the existence of
> "Coronatron" by Robert W.Stephens but I have
> never seen any photos or diagram of this monster VTTC.
> Vladi
> -----Messaggio originale-----
> Da: Tesla list [mailto:tesla@xxxxxxxxxx]
> Inviato: lunedì 22 gennaio 2007 1.35
> A: tesla@xxxxxxxxxx
> Oggetto: Really big VTTCs
> Original poster: David Speck <dave@xxxxxxxxxxxxxxxx>
> List,
> I asked this question a couple of years ago, but never really got a
> definitive answer.
> I've seen experimenters construct disruptive coils with secondaries
> from a few inches long to 60 feet tall.  Current SSTCs are
> approaching or surpassing the performance specs of the disruptive
> coils every day.
> By comparison, VTTCs seem to have topped out at a 4" x 20" secondary,
> driven by one to four 833A tubes.  The consensus seems to be that you
> can get just about as good performance from one 833A as with 4 of
> them, if you design the coil right.  Perhaps 36" discharges seem to
> be the limit for VTTCs on a good day.
> Is there some physical or electronic limitation to the design and
> construction of a really big VTTC?  With the availability of big
> surplus power tubes (10 kW or more) on eBay, and the possibility of
> multiple parallel free MOTs for input power, is there a physical
> reason why no one has built a 12 x 60 or 18 x 90 VTTC?
> Ten foot sword like discharges would be neat to watch!
> Dave