S.215 dummy valve, 1920-1929

Osram A.T.40 triode valve, 1921-1934

Collection of early valves, 1915-1945

DA 60 RF triode valve, 1929-1972

Marconi Osram DE 5b radio valve, 1920-1937

FE1 valve, 1920-1966

K.L.1 ungettered valve, 1920-1927

Amplifying valve type V24, 1920-1922

L.S.2 radio valve, 1920-1938

McVitie Weston valve collection

Transmitting valve type TT4A, 1919-1922

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