[GreenKeys] Radio valve/tube CG 502A

[drlegendre .]

The plane was a MiG-25 and it was landed in Hokkaido, Japan in 1976 by a
defecting Soviet pilot. It was not shot down, far as I know.

It was found to use the 6C33C tube in a primary voltage regulator. The
6C33C dual-triode is like a very hefty version of the 6AS7G / 6080WA or the
6336A - high Gm, exceptionally low rp (like, 60R) and consequently very low
mu. They are designed to handle serious power, and can run very hot - and
can be extremely hard on the socket, which requires regular replacement.
Some form of air cooling is a requirement, which isn't so hard to come
across in an aircraft.

This page seems to have good info on it: http://www.tubetvr.com/favtube.html

On Wed, Mar 22, 2017 at 4:40 PM, Dave Horsfall <dave at horsfall.org> wrote:

> On Wed, 22 Mar 2017, tony.podrasky wrote:
>
> > Reminds me of a story...
> >
> > Quite a few years ago there was a big ridicule against the USSR -
> > because they were still using tube radios.
>
> I believe it was a MiG that got shot down, and its hollow-state stuff was
> seen.
>
> My, how primitive!
>
> And then somebody realised that they would survive an EMP blast...
>
> --
> Dave Horsfall DTM (VK2KFU)  "Those who don't understand security will
> suffer."
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