Re: Big Triode Tubes

To: tesla-at-pupman-dot-com
Subject: Re: Big Triode Tubes
From: Dan Gowin <gowin-at-epic-1.nwscc.sea06.navy.mil>
Date: Thu, 05 Sep 1996 16:20:55 -0500

Tesla List wrote:
> 
> >From jim.fosse-at-bdt-dot-comThu Sep  5 06:56:16 1996
> Date: Thu, 05 Sep 1996 05:47:55 GMT
> From: Jim Fosse <jim.fosse-at-bdt-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: Big Triode Tubes
> 
> >From: Dan Gowin <gowin-at-epic-1.nwscc.sea06.navy.mil>
> >To: tesla-at-pupman-dot-com
> >Subject: Re: Big Triode Tubes
> [snip]
> >> I have seen that John Freau (tube coil guy) has acquired a pair of
> >> ceramic Eimac Tetrodes in the 4CX25,000 class.  The problem is the
> >> filament power at several hundred amps!!  Gotta wind your own Xfrmer!
> >>
> >> Richard Hull, TCBOR
> >
> >Richard,
> >       How about an ARC welder! I'm being sarcastic, the tube I'm
> >looking at is 7.5 V at 100 Amps on the filament. I'll probably use
> >a balanced neon for the plate, but I'll need to experiment and find
> >what filament currents will work. I already recognize that if the
> >current is to low, it will take forever to heat the tube.
> >
> Dan,
>         How about a "blown" neon for the filament supply? 7.5V -at- 65A
> is 12 turns of #4 on 1 half of my dead jefferson 15kV 60mA neon.
> Winding the other side with the same number of turns will give you
> 7.5V -at- 130A. You could also put half as many turns on each side and
> then put them in series to put the center tap to ground.
> 
>         jim
Jim,
	Good Idea. I have a coiler friend that just blew his neon
sign transformer with the same specs. I'll see if I can talk it out
of him. 

D. Gowin