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833A tube coil
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From: Pete [SMTP:casius-at-cyberserv.co.za]
Sent: Monday, June 01, 1998 11:51 AM
To: Tesla List
Subject: Re: 833A tube coil
Hi Ray,
Tx for dope on the 833A. When I 1st fired up the coil, the anodes took a bit
of a hammering with very short periods of rather orange. Since then I can put
on 2000VAC and get 13"-14" without any sign of glowing. Will keep it this way.
I obtained six of the 833A's from old AM transmitters. The two I'm using seem
OK, three give lower output (10" sparks) and one was a dud. But for an
equivalent of $1 per tube who can complain. By the way got a couple of RCA
5762/7C24 tubes from the same source
I think they are triodes???
Regards
Pete
Tesla List wrote:
> ----------
> From: Ray E. von Postel [SMTP:vonpostel-at-prodigy-dot-net]
> Sent: Saturday, May 30, 1998 5:20 AM
> To: Tesla List
> Subject: Re: 833A tube coil
>
> Tesla List wrote:
>
> > ----------
> > From: Pete [SMTP:casius-at-cyberserv.co.za]
> > Sent: Friday, May 29, 1998 1:55 PM
> > To: tesla-at-pupman-dot-com
> > Subject: 833A tube coil
> >
> >
> >
> >
> > pale orange colour, not red so as to cause concern. I'm not sure how
> > "red" the 833 anodes can glow before any damage occurs.
> >
>
> Pete:
> The 833 anodes, when running under C.C.S (Continuous Commercial Service)
> conditions should not get more than a dull cherry red. If you want long
> life from them I wouldn't run them redder than that. The tube manual does
> not give typical operating conditions for the 833 with an anode voltage of
> 2000 volts so it would be necessary to use the characteristic curves and
> work out just what the grid current and cathode current should be at that
> working voltage. Incidentally, the 833-A is (or was) not considered a
> particularly rugged tube. Unlike the 450-TL which was often used for the
> same purposes, the 833-A was not known as being overloaded and then coming
> back for more.
>
> Ray
>
> >
> >
> >
> >
> >