From the Vault

The contents page for HFN Aug ’56, as was common practice, included a description of its cover photography: ‘The Mullard “five-ten” and twenty watt amplifiers have not only provided home constructors all over the world with a first-class basis for their hi-fi equipment, but several manufacturers have adopted the design for their products.

On our cover [pictured above] we introduce Mr. W. A. Ferguson who designed them. The photograph was taken in the Valve Measurements and Applications Laboratory of Mullard Ltd., where these now-famous amplifiers were developed, and Mr. Ferguson is seen taking measurements on a prototype amplifier and preamplifier with the aid of a dual trace oscilloscope’.