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[Amps] Re: 4-400A Plate

To: <amps@contesting.com>
Subject: [Amps] Re: 4-400A Plate
From: sm2ekm@telia.com (Jan Erik Holm)
Date: Tue, 12 Nov 2002 16:21:43 +0100
Must be his brother!

/Jim SM2EKM
---------------------------

Bill Fuqua wrote:

> Sure this is not Alex again.. "mark" <mark@sandlabs.com>
> 73
> Bill wa4lav
>
>
> At 11:07 AM 11/11/2002 -0500, mark wrote:
>
>> I dought very much that the Anode is made of pure Tantalum, as this
>> materiakl is veri brittle in this form.
>> Also VERY expensive :)
>> For more about Tantalum go to :
>> http://www.tanb.org/
>>
>> Most of the Tatalum today, (99%) is used in the fabrication of high
>> capacity, small form factor capacitors.
>> Pure tantlaum sells for about 125 usd an lb in ingot or cap grade 
>> powder.
>>
>> A pure Tantalum Anode to resist the "white hot" temperature (a bit under
>> 2996 deg. C) should cost around
>> $1000 :)
>>
>> Mark
>>
>> ----- Original Message -----
>> From: "Peter Chadwick" <Peter.Chadwick@zarlink.com>
>> To: "amps" <amps@contesting.com>; "'Bill Fuqua'" <wlfuqu00@uky.edu>;
>> "'mark'" <mark@sandlabs.com>
>> Sent: Monday, November 11, 2002 10:24 AM
>> Subject: RE: [Amps] 4-400A Plate
>>
>>
>> > Mark said:
>> >
>> > >What is the use of the "glow" ??? Just wated energy :)
>> >
>> > In the case of a tantalum anode tube, the glow means that the plate 
>> is hot
>> > enough to absorb gas - a few metals have this property - so 
>> tantalum anode
>> tubes
>> > are meant to be run so hot.
>> >
>> > In any case, there's no more waste of energy than in a tube running 
>> at the
>> same
>> > efficiency and RF output with no glow.
>> >
>> > 73
>> >
>> > Peter G3RZP
>>
>>



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