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How do the Blackburn Microtech E813CC triodes work?

Posted by Bambi B (A) on July 28, 2009 at 06:25:28

In Reply to: Blackburn Microtech planar triodes. posted by Mike_in_MD on July 27, 2009 at 19:32:20:

PAINTING: "Death of a General Electric 6550A"

Mike in MD,

The development of the Blackburn Microtech E813CC as a radical departure from the traditional triode design is interesting. I'm intrigued by the construction alone, which appears almost like two transistors set on a stand on a bottle. And like anyone interested in valve stuff, I hope they are a revelation of sound, noiselessness, and longevity- and if so become reasonably priced. They will have to be quite nice if they want to be $50-60 each.

Blackburn Microtech themselves have been quite open about development problems including early versions being too microphonic and having a wider variability than the target Sovtek LPS. While I have such a mental block about electronics, it seems to me that the design of the mechanical aspects that it would not be difficult to derive a design that would considerably reduce microphonics, but that Microtech seem to have willfully attempted to find some degree of allowance of microphony for sonic reasons. It's a conventional wisdom that really non-microphonic tubes tend to be less dynamic and open.

The early reports of their sound and extreme quietness have all been cautiously positive. The place I use the most 12AX7s is the Fisher 800 receiver, which uses 8- 12AX7s, so I'd like to know more before replacing the 8- smooth plate Telefunkens,...

These are very interesting, but I've not seen any explanation of the way these work nor why they're referred to as "planar".

Can someone explain to a technically challenged Bambi what the electrons are doing in the Microtech E813CC?

Thanks!

Cheers,

Bambi B

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