RADIO DEVELOPMENT
ASTONISHING DISCOVERIES. IMPROVED BATTERY SETS. LONDON, April 10. So many astonishing wireless developments have occurred in the last few months that the technical journals complain of the difficulty of keeping abreast of them. The discovery of a quiescent pushpull which gives an output from battery sets equal to that obtained from electric sets, recently hailed as revolutionary, is already superseded by the invention of a “Class B’’ valve that costs 14/-. This, with a 120-volt battery current, gives fully two watts of undistorted output, sufficient to fill a concert hall, whereas even the largest sets operated from electric mains are capable of only If watts. The new valve, in spite of its power, uses less current than ordinary valves. New ferrocart coils, with a coil of finely-divided iron, give astonishing selectivity equal to the superheterodyne. Another important development is the Westector rectifier, composed of discs treated with copper. This gives fine selectivity, combined with considerable distortionless amplification. Experts consider that the combination of these three developments will make existing sets obsolete.
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Bibliographic details
Hawke's Bay Tribune, Volume XXIII, Issue 107, 19 April 1933, Page 11
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173RADIO DEVELOPMENT Hawke's Bay Tribune, Volume XXIII, Issue 107, 19 April 1933, Page 11
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