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Wireless Set No. 19 - Wikipedia

The early valve receivers were mostly of the tuned radio frequency TRF type, which often had an array of different knobs and switches on the front panel.

Tuning-in a station required the operation of several controls, and to change waveband sometimes required the plugging-in of different tuning coils. By the summer of , one and a half million receiving licences had been issued.

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Amateur Military Valve Radio Sets

Smaller valves were developed during the second world war, which eventually gave rise to the more compact receivers of the late 's and early 's. A Hart wireless accumulator from

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Historical Radio Society of Australia - HRSA - useful links

In those days mains electricity was provided by hundreds of small companies which supplied electricity in a variety of different voltages, frequencies and even D.

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Posted by 14.01.2019

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