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Re: [TowerTalk] Vacuum tube 100 years old today

To: "Steve Katz" <>,"'Tom Rauch'" <>, <>,"160m QTH" <>, <>
Subject: Re: [TowerTalk] Vacuum tube 100 years old today
From: "Jim Lux" <>
Date: Tue, 16 Nov 2004 18:34:15 -0800
List-post: <>
----- Original Message -----
From: "Steve Katz" <>
> > "For many applications a relative newcomer, the transistor,
> > is replacing vacuum tube types because of the greater
> > inherent reliability, lower power consumption, and smaller
> > size. However, the complete replacement of the tube by the
> > transistor does not seem likely, for the latter has
> > shortcomings at high temperatures and high radiation
> > intensities and in the production of high power at high
> > frequencies. "
> >
> > ::Funny part is, that description is still pretty accurate, isn't it?
> > Especially the part about high radiation intensities and the production
> > high power; I guess it depends on your definition of "high."  I haven't
> > seen any solid state microwave ovens yet....-WB2WIK/6

Kind of also depends on your budget and other requirements (such as
reliability, infrastructure costs, etc.).  Solid state amplifiers have
pretty much replaced high power tubes in a lot of L-band radar applications,
particularly phased arrays.  Microwave ovens are a pretty cost sensitive
(and not power efficiency or thermal dissipation critical) application.

For radiation resistance and such, materials like Silicon Carbide and
Gallium Nitride are the up and coming product.


See:  for "Self Supporting Towers", "Wireless Weather 
Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions 
and ask for Sherman, W2FLA.

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