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Re: [Amps] Supply question

To: "Ian White GM3SEK" <>, <>
Subject: Re: [Amps] Supply question
From: "Carl" <>
Date: Wed, 20 Jul 2011 18:58:23 -0400
List-post: <">>
----- Original Message ----- 
From: "Ian White GM3SEK" <>
To: <>
Sent: Wednesday, July 20, 2011 2:23 PM
Subject: Re: [Amps] Supply question

> kingwood wrote:
>>        As I recall, EIMAC' s "Care and Feeding of Power Grid Tubes"
>>says that the getter material, if any at all, is in the cathode
>>(filament) of the tube, not the anode.  It is the heating of the
>>filament, containing the getter material, that causes internal gas to
>>be ionized, emulsified, and bonded back into the metal of the anode
>>(plate) of the tube.  This is why an operator can "burn" the gas out of
>>an EIMAC tube, but can not, in tubes like the Penta Labs PL-172, which
>>has no getter material.
>>        With this in mind, the color of the anode (plate) of the tube
>>has nothing, or very little,  to do with "getter action",
> In almost every detail, that is flat-out WRONG.
> The AMPS archives contain plenty of accurate information on the subject
> of getters. Simply go to
> <> and type "getter"
> into the search field.
> -- 
> 73 from Ian GM3SEK

Thank you Ian for stepping in and correcting the myths surrounding these 
tubes. And Measures is still in dreamland spouting off about parasitics and 
bent filaments.
Some things never change but thankfully he is long gone from here.


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