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Each book also has short data on some obsolescent types, circuits, articles on construction and lists of valve sets for commercial radios and kits.

Like just about every other projection set of the time, the set uses the Schmit optical system and the 2½-inch Mullard MW6/2, with a seperate ringing choke oscillator to generate the enormouse 25KV it requires. The latter could be re-tuned to any of the then five channels, although they were pretuned before leaving the factory.

The channel can be identified by the colour of the attnuator cover, visible in the above photo as a yellow square, yellow being for London, single sideband.

Note the yellow paint on the brackets at the back of the chassis, further indicating this is the London single-sideband version.

A Mullard artical on the manufacture of junction transistors such as the OC44/45 and OC71 etc you find in many early transistor sets.

A fairly large selection ( The gallery of optoelectronics contains all the vacuum and gas-filled valves used for display or light detection.

Included are tuning indicators, photocells, flash tubes, a vidicon and a photomultiplier. Howe on the fiftieth anniversary of Fleming's invention of the first electronic valve.

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The power valves section reflects my interest in Amateur Radio and has examples of many of the classic transmitter valves used by amateurs from the 1940s to the present day.

Most of the classic audio output valves used in hi-fi and music amplifiers are also represented.

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