Re: Big Triode Tubes

To: tesla-at-pupman-dot-com
Subject: Re: Big Triode Tubes
From: Jim Fosse <jim.fosse-at-bdt-dot-com>
Date: Thu, 05 Sep 1996 05:47:55 GMT


>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