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He learned later that these receivers were made by amateurs because the factories only made equipment for the armed forces. He bought a triode valve called 'MICRO' and was told it had an amplification factor of 7. He wrapped it carefully in cotton wool for the return journey to Odessa.
In 1921 when he was in the 4th form at school he had bought two kits of parts from France and put them together with the help of his fellow-student George Grabinger. The kit consisted of a bright emitter triode in an oscillating circuit. The heater supply was a 4 volt accumulator, and a dozen or so dry cells, with an earphone in series, supplied the anode voltage.
Numerous important inventions such as the crystal detector, the oscillating valve, the triode valve have been due to private or amateur work. If full opportunities for such non-official research work are not restored, the progress of the art of radio telegraphy and radio telephony will be greatly hindered." Professor W.H. Eccles wrote: "Improvements and invention must be stimulated to the utmost.
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