Details

Includes photocopies pages of printed material, including: 'No. 4001 Valve', n.d. [1924?]; 'No. 4101-D & DL Valve', n.d.; '4316-A Valve Triode', 1937; '4304-B and 4304-BB Valves Triodes', 1937; '4019-A and 4019-B Valves Triodes', 1938; 'Valve Type 5D/100-A RF Power Pentode', 1939; 'Valve Type 3Q/200-A Single Ended Water Cooled Triode', 1940; 'STC Reference List: Valve Division, Ilminster', 1948; 'Repeater Triodes 3A/107A and 3A/107B', 1955; 'Paignton Valves used in BBC Transmitters', 1960; 'STC Special Valves: Screened H F Pentode SP41: CV1335, CV1574, CV1699, CV1700 Maintenance Type', 1965.