EMBARRASSING

Poverty Bay Herald, Volume LX, Issue 18066, 18 April 1933, Page 5

EMBARRASSING

WIRELESS DEVELOPMENTS

LONDON, April 8.

So many astonishing wireless developments have occurred in the last few months that the technical journals corn plain of q difficulty in keeping abreast of them.

The discovery oi a quiescent pushpull enabling an output from battery sets equal to that obtained from electric sets, recently hailed as revolutionary, is already superseded by the invention of a “Class B” valve, costing 14s, which, with a 120-volts battery current, gives fully two watts of undistorted output, sufficient to till a concert hall, whereas even the largest sets operated from electric mains are capable of only watt. The new valve, despite 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, enabling fine selectivity, combined with considerable distortionless amplification. Experts consider that combination of these three developments will make existing sets obsolete.