Reference 4112

(1965) Valve and Cathode Ray Tube Manual No. 10, London: Thorn-AEI Radio Valves and Tubes Ltd.
Here is the original invoice for this manual. The purchaser, Philip H Bearman, originally rented out TVs but found selling valves and CRTs more lucrative. He even branded and boxed his own valves under the logo PHB.
Thanks to Bob Hayter G4DAC for donating this manual to the museum. As a schoolboy Bob spent many an hour labelling boxes and putting in the valves. Philip Bearman bought the valves in trays of 100, packed 10 x 10 square.