The three pocket-sized valve data reference books, which date from 1954 to 1975, are an important backward glance at the pre-digital age. They contain data for Mazda, Mullard, and Ediswan valves and picture tubes and have individual and striking front and rear cover artwork; they are works of art in their own right.

Among the detailed technical information, valve pin configuration, etc., are period advertisements, historical references, and amazing black-and-white photographs of valve and picture tube manufacture.

These wonderful reference books remain in superb condition despite being used in my father's electrical workshop for many years, all pages are present and attached, no annotations or tears, some rubbing to the corners and obvious signs of light use.

The largest book measures around 6 inches/150mm x 4 inches/100mm.

UK shipping is included in the price. A discount is available for collection from our Derby warehouse.

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