Re: Filament Issue

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Mitchell" <electrontube-at-sbcglobal-dot-net> 

It was fine all along, I guess I didn't remeber right, that it was indeed
9.8v, strange that I cannot get my VTTC to work well anymore, now it just
makes a 1" corona, I think the G2 connection fell off :-P  So I will go and
reattatch that, maybe Ill put it to the plate this time and see what
happens, as I won an amperex 5868 on ebay, and don't really have a use for
tihs 813, maybe a big plasma tweeter or a amplifier?

Regards - Jim Mitchell

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, December 01, 2003 7:03 PM
Subject: Re: Filament Issue


 > Original poster: "Steven Ward" <srward16-at-hotmail-dot-com>
 >
 > You bet its a problem!  The tube needs to be a certain temperature for it
 > to go into its normal emission state.  4V is a far far cry of
 > 10V!  Normally, we use something like a -2%/+5% tolerance for tubes.  So
 > you want like 9.8-10.5V on that filament.  Your lucky you did not destroy
 > the tube already. Its very bad to run a tube that is not fully heated.
Get
 > a new filament supply!
 >
 >
 > >From: "Tesla list" <tesla-at-pupman-dot-com>
 > >To: tesla-at-pupman-dot-com
 > >Subject: Filament Issue
 > >Date: Mon, 01 Dec 2003 08:03:34 -0700
 > >
 > >Original poster: "Jim Mitchell" <electrontube-at-sbcglobal-dot-net>
 > >
 > >Hi, I was testing the voltage to the filament on my 813 tube in my VTTC,
 > >and I noticed that it was like 4v, when the 813 has a 10v filament!  I am
 > >wondering, is this a bad thing?  The filament does get hot, and the VTTC
 > >works, but it doesn't work optimum, could low heater voltage cause this?
 > >
 > >Regards - Jim Mitchell
 >
 >