Re: Vacuum Tube Tesla Coil Design (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Tue, 25 Sep 2007 20:55:20 -0500
From: James <mustang3@xxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Vacuum Tube Tesla Coil Design (fwd)

Hi Brad, I've been using the same schematic for 40+ years now. The main 
change in my design is I place the tickler coil (feedback) beneath the 
primary coil. This prevents flashover from the secondary. One of my toob 
coils uses a 3CX3000F1 triode, 6" X 26" secondary wound with #30 wire. 
Primary coil is 32T #10 THHN house wire on a 14" diameter form, primary cap 
is .006@xxxxxx, tickler coil is 17T #20 hookup wire wound on same form. The 
grid leak is a .01@5000V and the resistor is 2.7K@300W. The power supply is 
a 7.2KV pole xmfr with a FW bridge rectifier. With 5KV on the tube, it draws 
75A from the wall (@240V). This coil has about 30-32" corona. Melts a piece 
of #10 copper wire in a few seconds. I have an O'scope with a high voltage 
probe so that I can observe the grid of the tube during operation. I also 
have a spectrum analyzer so I can see the fundamental frequency and any 
harmonics that pop up. I have a lot of fun with the tube coils. My first one 
used an 811, not even an 811A. It worked well. I used it to drive an old 
vacuum tube for x-rays. Turns out that x-ray PS was a principal use for 
TC's. Later, James
----- Original Message ----- 
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Tuesday, September 25, 2007 3:27 PM
Subject: Re: Vacuum Tube Tesla Coil Design (fwd)


>
> ---------- Forwarded message ----------
> Date: Tue, 25 Sep 2007 13:21:31 -0400
> From: Brad Stockdale <brad@xxxxxxxxxxxx>
> To: tesla@xxxxxxxxxx
> Subject: Re: Vacuum Tube Tesla Coil Design
>
> Hello everyone,
>
>   I posted a while back about a batch of 4-400 tubes I was gifted. I also
> have a stack of MOT's in good working order. I would like to design a 
> VTTC.
> I've found many sites and a few programs that help with the design of
> standard spark gap type coils, but none really mention VTTC's directly.
>
>   I realize that a lot of the calculations will remain the same. However, 
> are
> there any formulae that I should know about specifically for designing a
> VTTC?
>
>   Are there any sites about the design of VTTC's?
>
> Thank you,
> Brad
>
>
>
>