VFO Circuit using Space Charge Tube?

[J Forster]

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
>
> > -----Original Message-----
> > From: Boat Anchor Owners and Collectors List
> > [mailto:BOATANCHORS at LISTS.TEMPE.GOV]On Behalf Of kd4e
> > Sent: Tuesday, September 30, 2008 8:24 PM
> > To: BOATANCHORS at LISTS.TEMPE.GOV
> > Subject: VFO Circuit using Space Charge Tube?
> >
> >
> > Anyone have a good VFO circuit for a HF transmitter
> > that uses a "Space Charge" or other 12vdc tube?
> >
> > I did a bunch of online research on Space Charge tubes,
> > pencil tubes, and low voltage subminiature tubes.
> >
> > The closest thing was this 12vdc tube QRP transmitter
> > using a 12AC6 crystal oscillator and a 12J8 buffer
> > http://ja9ttt.homedns.org/hamf/myexp/12V_Tube_QRPp_Transmitter.html
> >
> > The Japanese-to-English translation is rough but from
> > the schematic and text does anyone see any reason that
> > this could not be converted to a multi-band HF VFO?
> >
> > Here are the other low-voltage tube links that I found:
> > http://kd4e.com/pp.html
> >
> > --
> >
> > Thanks! & 73, doc, KD4E

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