VFO Circuit using Space Charge Tube?

[J Forster]

I got mine in England in 1956. It was a commercial, then state of the art, unit.

BTW, there is a video of the Raytheon subminiatiure tube manufacturing line at:

http://techtv.mit.edu/file/1125/

Best,
-John

==============

David C. Hallam wrote:

> Hi,
>
> Mine was a little earlier than yours. As I remember, two tubes actuating a
> sensitive relay to escapement type rudder only control with a long rubber
> band running down the fuselage to turn the escapement.
>
> I built my own transmitter, single tube crystal controlled oscillator.  I
> don't remember what tube I used but it must have been something from a
> battery operated portable radio.  I suppose by the rules you weren't
> supposed to do that on the Citizens Band.
>
> David
> KC2JD/4
>
> > -----Original Message-----
> > From: J Forster [mailto:jfor at quik.com]
> > Sent: Wednesday, October 01, 2008 12:09 PM
> > To: dhallam at rapidsys.com
> > Cc: BOATANCHORS at LISTS.TEMPE.GOV
> > Subject: Re: [BOATANCHORS-TEMPE] VFO Circuit using Space Charge Tube?
> >
> >
> > Hi,
> >
> > The  was a Raytheon RK61. I have such a receiver. It used the
> > tube in the front
> > end, several OC-xx transistors in audio amp stages, a resonant
> > multi-reed relay,
> > controlling six tiny relays to run the actuators.  The
> > transmitter was hybrid too.
> >
> > Best,
> > -John
> >
> > ================
> >
> > David C. Hallam wrote:
> >
> > > Back in the early 1950's when I was messing around with model
> > airplanes, we
> > > used a subminiature gas tube in the receivers with a 22.5V
> > battery for the
> > > plate supply for RC airplanes.  As I recall they were made by
> > Sylvania and
> > > had originally been developed for use in WWII proximity fuses.  This was
> > > back when the first Citizens Band had been authorized.  We used
> > 27.255 MHz.
> > > I think I still have some of the crystals around I used in the
> > transmitters.
> > >
> > > David
> > > KC2JD/4

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