Re: OLD Tubes/Coils - filament power (fwd)

• To: tesla-at-pupman-dot-com
• Subject: Re: OLD Tubes/Coils - filament power (fwd)
• From: Tesla List <mod1-at-pupman-dot-com>
• Date: Sun, 2 Mar 1997 22:29:49 -0700 (MST)
• Approved: mod1-at-poodle.pupman-dot-com

---------- Forwarded message ----------
Date: Sun, 02 Mar 1997 16:59:06 -0800
From: David Trimmell <dwt-at-efn-dot-org>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: OLD Tubes/Coils - filament power 

  Hello,

 > *Never* operate tubes (at least those with thoriated heaters) with
>less than their rated voltages and currents. Doing so will strip the
>cathodes in short order. You may get lots of filament life with near
>zero emission. Standard incandescent Light bulbs are a different story

>entirely. The warning also applies to halogenated bulbs which will
>have their lives shortened since the chemical processes in them rely
>on running their at the high temperatures as far as I am aware.

>Malcolm

I was wondering if anyone knew if the 803's use a thoriated filament? I
am using two 803's in parallel, with several turns on top of the primary
of the microwave transformer to get about 9.5 volts to power the
filaments, since this arangement isn't curent limited, am I in danger of
damaging these filaments?
Thanks,

David Trimmell

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