This is a publication from Standard Telephones and Cable, Issue No. 24, featuring Brimar Radio Valves and Teltubes. It is a valuable resource for collectors and enthusiasts of vintage radio equipment. The book covers information on valves and teltubes from the 1960s,

8 SECTIONS IN A LARGE FOLDED SHEET SIZE 21" X 21". CONTENTS INCLUDE ENGLISH TYPES. AMERICAN, OCTAL TYPES. MINATURE TYPES.  BASE CONNECTORS. UNDERSIDE VIEWS. ENGLISH EQUIVALENTS. GERMANIUM DIODES. BRIMAR TELETUBES.  G AND GT TYPES. OCTAL BASE CONNECTIONS. ENGLISH TYPE EQUIVALENTS. BATTERY LOCTALS. MAINS MINS. MAINS OCTALS  ETC. GOOD CONDITION