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Re: OLD Tubes/Coils - filament power (fwd)
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To: tesla@pupman.com
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Subject: Re: OLD Tubes/Coils - filament power (fwd)
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From: Tesla List <mod1@pupman.com>
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Date: Mon, 3 Mar 1997 21:32:35 -0700 (MST)
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Approved: mod1@poodle.pupman.com
---------- Forwarded message ----------
Date: Tue, 4 Mar 1997 09:10:32 +1200
From: Malcolm Watts <MALCOLM@directorate.wnp.ac.nz>
To: tesla@pupman.com
Subject: Re: OLD Tubes/Coils - filament power (fwd)
Hi David,
> 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
There is no problem for filaments which have a _specified voltage_.
They settle at their own currents. In this case, the applied voltage
should be within 5% of that stated. Tubes with a spec'd filament
current are a different matter.
Malcolm