GB> Looking for info on beam-deflection tube mixers

[Chris Trask]

On Wed, 6 May 1998, michael silva wrote:

> Hi all,
>
> I'm thinking out my next project, a portable CW transceiver, and I'd
> like to know what you all know about using beam-deflection tubes (not
> the 7360 due to its cost, but I've got some 6ME8s floating around) as
> mixers and detectors.  What exactly are the advantages in both mixer
> and detector service?  I gather that they are fairly quiet -- true?
> Any other reason to use or not use them in either circuit application?
>

        Another envelope is the 6AR8.  These tubes were very susceptible
to magnetice fields (just like a CRT) and were usually shielded.  For all
intents and purposes, they are very much like a long-tailed pair, which
is a differential pair of triodes having a common cathode which is then
connected to the plate of a third tube used as a current source.  For
mixers, modulators, and synchronous detectors they're great.


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