The first post-war Radio Exhibition gave a clear indication of how the industry had progressed during the past seven years. Equipment of every kind was better designed and better made, while the uses of radio and radio-like devices had been vastly extended, partly thanks to miniaturization and tropicalization. In communications, the greatest advance had been in pulse modulation techniques and in the attainment of a high degree of secrecy by the use of cencimetric waves in narrow beams.
The Williamson amplifier design, published this year, seemed to satisfy the most exacting requirements of the 'high-fidelity' enthusiasts and soon variants of it were to appear in many countries. It was the first design for home construction to exploit the use of direct coupling and meticulous design in the output transformer to reduce phase shifts and to enable a high degree of negative feedback to be used with stability.
The Marconi Company celebrated its 50th anniversary.