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Re: H2 driver

Subject:      Re: H2 driver
       Date:  Fri, 30 May 1997 06:57:46 -0700
       From:  Bert Hickman <bert.hickman-at-aquila-dot-com>
Organization: Stoneridge Engineering
         To:  Tesla List <tesla-at-pupman-dot-com>
 References:  1


Tesla List wrote:
> 
> Subject: H2 driver
>   Date: Wed, 28 May 1997 20:55:20 -0400 (EDT)
>   From: richard hull <rhull-at-richmond.infi-dot-net>
>     To: tesla-at-pupman-dot-com
> 
> All,
> 
> I just cobbled up my table top maggey driver to monkey around with some
> ideas which may make maggey 13.  I am labeling this table model maggey
> 12.
> I am using a Hydrogen thyratron 3C35 for the switch.  I am pulsing it at
> a
> 1khz rate and its uses about 80-100 watts from the DC supply in this
> mode.
> I have the driver just running as a simple coil here now and I get about
> a
> 4" spark when tuned to resonance (500khz) and approached with a grounded
> rod.  It is bright and noisey (k=.55).  I am worried that it is still
> too
> high impedance a driver due to the high Q developed by an otherwise low
> Q
> circuit!  The darned tube actually supplies current to the primary tank
> for
> 1.6 usec (far too short-I think).  The coil, due to a large 12"X4"
> toroid,
> doesn't break out and a stub antenna 10 feet away collects the RF soup
> into
> an Oscope.  I count 50+ rings in the beautifully decremented envelope.
> A
> huge Q for this coupling! (by normal cogitatin').  I just have to work
> on
> the phased back to back idea.
> 
> A normal neon 60 ma 6KV AC tranny with a rotary gives about an 8" spark
> at
> 160 watts.
> 
> The coil is a 10.5 diameter by 6" tall form wound with 20 ga. wire.  the
> primary is RG 214 of 5 turns.  Cap is ~ .008ufd and the tap is at about
> 18-20uh.
> "Sqwat and Hot".
> 
> I'll keep you folks up on this one.
> 
> Richard Hull, TCBOR

Richard and all,

The 1.6 uSec dwell time sounds like it's about in the ballpark for the
high k you're running at. Are you getting a single half-wave current
pulse through the thyratron?  I'm very interested in getting further
information on any back-to-back configuration you might come up with.
I've just picked up a number of 4C35's (at 50 cents apiece :^)). Where
do you find sockets for these things??

-- Bert --