Re: [TCML] Variac Amps for a VTTC?

[james danky <jpdanky@xxxxxxxx>]

Hi, the list is beyond my interest in most ways, I just want to know when the Baraboo show is in September, just have to see it.  Jim
On May 11, 2011, at 7:21 PM, Futuret wrote:

> Hi,
> 
> For my 24" spark VTTC which used two 833A tubes, I often ran it
> from a 10A variac for short runs.  The old Powerstat variacs are
> robust and can provide easily twice their rated current for short runs. 
> The VTTC drew about 2400 VA.  The variac was a 140V "step-up"
> type.  The use of the step-up feature stresses the variac more
> than just 120V output usage.  The VTTC was run from a single
> 2400V VTTC with shunts removed and a doubler (level-shifter)
> circuit.  I had my staccato pulser circuit installed, so this 
> reduced the input power when staccato was engaged.
> VTTC's are power-hungry for a given spark length of
> course without staccato.  I use the formula:
> 
>  spark length inches = 0.5*sqrt input power (wallplug watts)
> 
> I show some VTTC stuff at my website at:  (there are various VTTC links
> to my pages)
> 
>    http://futuret.110mb.com/index.htm
> 
> Cheers,
> John
> 
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> 
> From: carsten [mailto:cgz365@xxxxxxxxx] 
> 
> Sent: Wednesday, May 11, 2011 10:19 AM
> 
> To: tesla@xxxxxxxxxx
> 
> Subject: [TCML] Variac Amps for a VTTC?
> 
> 
> 
> I'm working on my first coil and plan to use 1-2x MOTs in series with 1-2 GU-81m 
> 
> tubes.  How big if a variac do I need @120vac?  I'm guessing a minimum of 10A, 
> 
> but probably 20A to be on the safe side.  What woudl be the requirement for 1 
> 
> MOT vs 2?
> 
> 
> 
> Thanks!
> 
> 
> 
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James P. Danky
Project Director
Newspapers & Periodicals of the African Diaspora
School of Journalism & Mass Comm.
608/239-7587
FAX:608/262-1361
jpdanky@xxxxxxxx


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