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Updated: May 14, 2025
"Granted," the colonel said agreeably, "but it's quite obvious that there are parts of our technology that are just as alien to him as parts of his are to us. Remember how he went to all the trouble of building a pentode vacuum tube for a job that could have been done by transistors. His knowledge of solid-state physics seems to be about a century and a half behind ours."
The transmitter was completely 'home brew', consisting of a metal 6L6 Franklin oscillator on 3.5 MHz followed by two more 6L6s doubling to 14 MHz. In the final amplifier stage Harry used a Telefunken pentode, the famous and very efficient RL12P35 which was used in the German tank transmitters in all stages, oscillator, P.A. and audio amplifier/suppressor grid modulator.
When I first began transmitting six years later, having 'discovered' the amateurs, I chose the callsign RX as I had been a listener so long, and also remembering the excitement of listening to G6RX. In 1930 I moved to Athens and became a salesman for RCA radios. My first transmitter was just an electron coupled oscillator using a type 59 output pentode from a radio.
In 1935 George and his father Costas built a one-valve transmitter using a type 59 pentode with suppressor grid modulation, and succeeded in contacting most of the world with this QRP rig. The electron coupled oscillator could not have put more than 4 or 5 watts into the antenna.
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