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Re: [Amps] ceramic vs glass

To: <amps@contesting.com>
Subject: Re: [Amps] ceramic vs glass
From: "Ian White" <ian@ifwtech.co.uk>
Reply-to: ian@ifwtech.co.uk
Date: Sun, 25 Jan 2015 12:43:39 -0000
List-post: <amps@contesting.com">mailto:amps@contesting.com>
> 
> It's not the Ceramic Vs glass that requires the protective circuits, it
> is the internal structure of grid and screens with very little
> dissipation that require the protective circuits.  When 8877s were $300
> you didn't see much in the way of protection.  Now the Eimac versions
> are over a kilobuck, over drive protection has become popular, so too
> has the awareness of IM products.
> 
> It's the lack of awareness that has given Tetrodes a bad name.  The
> 4CX1500B and Chinese FU728F have very good IM products and are quite
> linear when operated correctly and not over driven.  (Tuned and loaded
> as a Tetrode and not as a triode)
> 
> 73
> 
> Roger (K8RI)
> 
>
Exactly. The increased need for protection isn't due to any differences
between glass and ceramic construction, but all the other internal changes
that were introduced at the same time - along with ever-increasing
replacement costs.


73 from Ian GM3SEK


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