[Milsurplus] TBX-4 photos available.

[Kenneth G. Gordon]

> Once-upon-a-time I owned a TBX, and was surprised and pleased at the 837 
> oscillator/transmitter.  Worried about the crystal current, I found it 
> was so low I couldn't measure it.  This is stunning for an oscillator 
> running at 500 volts and 15 Watts output.

Then, you should be totally amazed at a crystal oscillator running 200 
watts input. Crystal current is 17 mA.

See the RCA Ham Tips from December 1938, schematic, and photos of 
an operating one here:

http://www.mines.uidaho.edu/~glowbugs/813osc.htm

Ken W7EKB