Re: [TCML] Variac Amps for a VTTC?

[carsten <cgz365@xxxxxxxxx>]

Thanks John.  I have already came across your site in my research.  Good stuff!

In the future I may be running the coil for extended periods of time, so I will err on the side going larger, the 15-20A range and if need be, just under drive it a little.

Carsten



________________________________
From: Futuret <futuret@xxxxxxx>
To: tesla@xxxxxxxxxx
Sent: Wednesday, May 11, 2011 7:21 PM
Subject: Re: [TCML] Variac Amps for a VTTC?

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


  













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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