R: [TCML] unknown tube...

["mazzilli vladimiro" <vladmiro.mazzilli@xxxxxxxxxx>]

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.
>
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> 48)
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10:06 AM
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>

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