Re: [TCML] unknown tube...

["Brian Foley" <ka1bbg@xxxxxxxxxxx>]

Hi, I am not a lamp expert but worked with some high pressure uv tubes and
flash lamps......the envelope on a halogen lamp has to run very hot, finger
prints causes a hot spot on the surface and failure of the lamp
envelope......this is also true of short arc lamps and the such....radio
tubes, at least recieving tubes doesnt bother them much but transmitting
tubes the envelope will be comprimised by finger prints and the such..
going after the envelope with alcohol will clean it, however usually erasing
the tube number printed on the envelope......
normal precedure when installing transmitting tubes is to handle them with
rubber gloves or by holding onto the base.....so as to not make a hot spot
in the envelope. cul brian f.


      www.genapro.com
----- Original Message -----
From: "Jim Mora" <jmora@xxxxxxxxxxx>
To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
Sent: Saturday, February 09, 2008 5:55 PM
Subject: RE: [TCML] unknown tube...


> Hello coilers,
>
> I know it is true that one shalt not touch the glass of a halogen bulb or
> the vacuum will be compromised by the oils in the skin. Is this true in
> general of vacuum tubes?
>
> Jim Mora
>
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
> Of mazzilli vladimiro
> Sent: Saturday, February 09, 2008 6:00 AM
> To: 'Tesla Coil Mailing List'
> Subject: R: [TCML] unknown tube...
>
> The number of connected electrodes suggest a triode configuration, the
> base is a bayonet type with short pin (4 pin jumbo base), different from
> 801,802,803,804,811,812,813,814 is similar to 810, but without lateral
> grid connection pin my attention is focalized on 805 with a different
> plate cap. Usual plate cap for 805 RCA,GE,Amperex is the same of 813.
>
> -----Messaggio originale-----
> Da: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] Per conto
> di Brian Foley
> Inviato: sabato 9 febbraio 2008 5.23
> A: Tesla Coil Mailing List
> Oggetto: Re: [TCML] unknown tube...
>
>
> Hi, wrong base for 811, but maybe 805 or 813 was very common.....cul
> brian f.
>
>
>       www.genapro.com
> ----- Original Message -----
> From: <Davetracer@xxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Friday, February 08, 2008 10:34 PM
> Subject: Re: [TCML] unknown tube...
>
>
> >
> >
> > In a message dated 2/8/2008 10:56:04 A.M. Mountain Standard Time,
> > ashumate3@xxxxxxx writes:
> >
> > _http://img249.imageshack.us/my.php?image=img3701ix0.jpg_
> > (http://img249.imageshack.us/my.php?image=img3701ix0.jpg)
> >
> > I believe that tube is an 811A triode.
> >
> > Those started off as a GE tube of the 1930's for high power
> > applications, but interestingly, were also manufactured later in the
> > USSR. (I have one
> that
> > says, "Built in the U.S.S.R." just to make that clear. In red ink,
> > too.) They're  apparently being made in China now and quality is all
> > over the
> place.
> >
> > You could try 6.3 volts on the heater circuit and see if it lights up,
>
> > or
> at
> > least test for ohms across heater.
> >
> > Heater is on 1 & 4, grid is on 3, top cap is what you think.
> >
> > Good luck,
> >
> > Dave Small
> >
> >
> >
> >
> > **************Biggest Grammy Award surprises of all time on AOL Music.
> >
> (http://music.aol.com/grammys/pictures/never-won-a-grammy?NCID=aolcmp003
> 0000
> 00025
> > 48)
> > _______________________________________________
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> >
> >
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> 2/8/2008
> 10:06 AM
> >
> >
>
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