Image
Category
Collection
Maker
Object type
Place
Material
Date

KTD power amplifier

1918

Moorhead thermionic triode valve

1922

Thermionic triode valve

circa 1920s-1930s

Thermionic triode valve

Mullard D0.6 triode

Wade Bequest: DE6b triode radio valve with green tint

Wade Bequest: DER triode radio valve

Neutron thermionic triode valve

1930

Wade Bequest: DER triode radio valve

Wade Bequest: DE6 triode radio valve with blue tint

Wade Bequest: ORA triode radio valve

Thermionic triode valve

1924

Ediswan thermionic triode valve

1923

Marconi thermionic triode valve

1923

Marconi thermionic triode valve

1927

Marconi Osram thermionic triode valve

1932

Marconi Osram thermionic triode valve

1927

Metropolitan-Vickers thermionic triode valve

1925

Marconi thermionic triode valve

1943

Cossor thermionic triode valve

1932

Marconi thermionic triode valve

1923

Edison Swan thermionic triode valve

1932

Metropolitan-Vickers Cosmos thermionic triode valve

1923

Mullard Triode Valve MZ05-60

Marconi thermionic triode valve

1925

Metropolitan-Vickers thermionic triode valve

1925

Marconi Osram thermionic triode valve

1925

Marconi Osram thermionic triode valve

1925

Marconi Osram thermionic triode valve

1925

Marconiphone thermionic triode valve

1942

Mullard thermionic triode valve

1928

Marconi Osram thermionic triode valve

1923

British Thomson-Houston thermionic triode valve

1928

British Thomson-Houston thermionic triode valve

1924

Wade Bequest: DER triode radio valve

Wade Bequest: ONEVOLT ORA triode radio valve

Amrex thermionic triode valve

circa 1923

Cleartron thermionic triode valve

1927

Marconi Osram thermionic triode valve

1935

Metropolitan-Vickers Cosmos thermionic triode valve

1925

Cossor triode valve

circa 1930

Marconi triode valve

1931

Marconi thermionic triode valve

1940

Mullard thermionic triode valve

1923

Fellows thermionic triode valve

1923

Marconi thermionic triode valve

1923

Ediswan thermionic triode valve

1928

Marconi Osram triode valve

circa 1920

Marconi Wireless Telegraph thermionic triode valve

1918

Marconi Osram thermionic triode valve

1925