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Re: Big Triode Tubes



Just a thought here. Since the neon output power is limited, the filament
might not get up to speed due to the low cold resistance. On the other hand
it would seem to be an automatic mechanism for slow starting, like a variac
would due.
Dave Huffman
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> From: Tesla List <tesla-at-poodle.pupman-dot-com>
> To: Tesla-list-subscribers-at-poodle.pupman-dot-com
> Subject: Re: Big Triode Tubes
> Date: Friday, September 06, 1996 4:25 AM
> 
> >From MALCOLM-at-directorate.wnp.ac.nzThu Sep  5 22:26:04 1996
> Date: Fri, 6 Sep 1996 14:09:46 +1200
> From: Malcolm Watts <MALCOLM-at-directorate.wnp.ac.nz>
> To: tesla-at-pupman-dot-com
> Subject: Re: Big Triode Tubes
> 
> 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