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Updated: May 23, 2025
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.
A museum in that city tells the full story of the first broadcasting station in the whole of the Balkans. Broadcasting in the capital, Athens, started on March 25th 1938 when a second-hand 15 kW Telefunken transmitter was put into operation in the suburb of Liosia.
Apart from the patents taken out by Sir Oliver Lodge and Dr Alexander Muirhead, in 1897, patents were taken out in Germany by Professor Braun of Strasbourg, who was joined by Professor Slaby and Count D'Arco in 1903 to form the Telefunken company, and in the U.S.A. by Dr Lee De Forest of the American De Forest Wireless Telegraph Company who was the first to use a high A.C. voltage of 20,000 volts to obtain the necessary high-potential discharges, thus dispensing with the induction coil.
The first transmissions of speech and music in England were made from Chelmsford, Essex, when a 15kW transmitter of the Marconi Company began regular transmissions in February of 1920. In the summer of 1924 the world's greatest radio companies British Marconi, German Telefunken, French Radio Telegraphie and American R.C.A. met in London to discuss transatlantic communications.
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