VFO Circuit using Space Charge Tube?

[kd4e]

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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