Re: Big Triode Tubes

To: tesla-at-pupman-dot-com
Subject: Re: Big Triode Tubes
From: Malcolm Watts <MALCOLM-at-directorate.wnp.ac.nz>
Date: Fri, 6 Sep 1996 14:09:46 +1200

Just a thought if anyone considers rewinding a neon for a bottle 
power supply...

> >   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.

You could pop a heater winding on one leg and a suitable HT winding 
on the other for an all-inclusive compact supply. The insulation 
should certainly be there.
    I wonder about the wisdom of using the shunted core for a 
filament supply though. Seems to me that voltage regulation will be 
rather poor.

Malcolm