Re: Primary Coil Design

Hi Mark,

That would indeed be a lot of fun.  I could see taking one of the cover
plates off and setting the main tank coil a few feet outside of the cabinet
and putting up a secondary with just enough coupling to not be overdriven.
Build a monster toroid, etc., etc.

Two very important experiments are currently hooked up to my 25kW machine
right now and the people using it would have a bird if I suggested this. No
sense of adventure I guess.  Besides, the brute weighs something like 2000
pounds and there is only enough room to walk around it right now.  I
recently had to buy a spare oscillator tube - $6500 each!!!!

As a kid I used to take apart old TVs and make radios, HV powers supplies
and the like, so someday I will build a continuous power TC but my boss
won't buy into doing it a work.  Also my wife would freak if I brought it

Bigger, better, noisier.


>>From mrbarton-at-ix-dot-netcom-dot-com Sat Mar 30 07:12 MST 1996
>>Received: from dfw-ix3.ix-dot-netcom-dot-com (dfw-ix3.ix-dot-netcom-dot-com
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<tesla-at-grendel.objinc-dot-com>; Sat, 30 Mar 1996 02:51:20 -0700
>Date: Sat, 30 Mar 1996 01:47:53 -0800
>From: mrbarton-at-ix-dot-netcom-dot-com (Mark Barton)
>Subject: Re: Primary Coil Design
>To: tesla-at-grendel.objinc-dot-com
>Hi Harry,
>Say, why don't you shape a work coil into a Tesla primary and wind a 
>secondary to match your operating frequency.  At 25KW continuous power 
>you'd have a beautiful whipping, hissing, spitting, display.  I built a 
>FET driver that operated at 8KW continuous which produced a 4 foot 
>sheet of electrical flame that sounded like hell's welding torch.  
>Several years ago I combed an induction heater surplus yard with just 
>this idea in mind.   Do it, do it, do it.
>>I,ve been working with induction heaters in the 200 kHz to 600 kHz
>>frequency range for about 5 years now.  One common material that is 
>>easy to heat inductively is graphite. It has  a resistivity about 800
>>times higher than copper.  This means it gets hot a lot faster than
>>copper does in the same RF field.