"Scott Dorsey" wrote in message
...
Robert Seely wrote:
I have a bunch of Raytheon Subminiature tubes that I
inherited from
my
Father, who was an electronics bugg (I followed a
different path)
that
have code QF-721. In searching the internet I have found
a bunch of
identical looking tubes such as one labeled CK6088. I have
done lots
of searches on the internet and I cannot find out anything
about
these
and am wondering if you know about these, or if you can
point me to a
website that might shed some light on these.

That's a Raytheon experimental number. I have a Raytheon
document
dated 1953 which lists a bunch of the QF numbers but not
that one.
These were never intended to be sold to the general public
and so were
not listed in the handbooks.

These are apt to be a variant of some relatively standard
submini tube
but without the original documentation or without a sample
tube to put
on the curve tracer I am not sure how we'd know precisely
what it is
a variant of.

Almost certainly your father bought a bunch of these from
a surplus
dealer. In the fifties and sixties there was a lot of
wacky stuff
coming loose from manufacturers like this.

I am considering the possibility of donating these to
someone but if
I
cannot find out what they are for, I cannot imagine how I
can find
who
to donate them to -- perhaps a school or something.

If you send me one I'll put it on the curve tracer and
tell you more
or less what it is. Submini tubes in general are not
worth very much
because the Raytheon plant was still making them well into
the late 1980s
and they're still coming out of the surplus pipeline even
today. But
they are still very, very cool and a lot of fun for small
radio and
audio projects.
--scott

Among other applications sub-miniatures were used in
hearing aids and model aircraft controllers.


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--
Richard Knoppow
Los Angeles
WB6KBL