>
> 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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