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Re: [Amps] 813's

To: Steve Thompson <g8gsq@eltac.co.uk>, amps@contesting.com
Subject: Re: [Amps] 813's
From: Bill Fuqua <wlfuqu00@uky.edu>
Date: Mon, 29 May 2006 09:52:49 -0400
List-post: <mailto:amps@contesting.com>
I may have an idea where the confusion comes from. RCA made two different 
813's one with a graphite plate and the newer version with a metal plate. 
There may be other internal differences between the older 813's and the new 
newer ones. And the filament could be one of them.

73
Bill wa4lav


At 07:21 AM 5/29/2006 +0100, Steve Thompson wrote:


>Will Matney wrote:
> > Peter,
> >
> > While on the subject, you wouldn't know the approximate G1 input 
> impedance would you? That is with the specified plate and grid voltages 
> on the tube.
>
>If there's no grid current flowing, doesn't it just look like a
>capacitor for all normal purposes?
>
>Steve
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