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Audion triode

Audion triode

De Forest Radio Telephone & Telegraph Company
circa 1908
Audion triode

Audion triode

De Forest Radio Telephone & Telegraph Company
circa 1908
Audion triode

Audion triode

De Forest Radio Telephone & Telegraph Company
circa 1906
Audion triode with dual filament

Audion triode with dual filament

De Forest Radio Telephone & Telegraph Company
circa 1908
Audion triode with two plates

Audion triode with two plates

De Forest Radio Telephone & Telegraph Company
circa 1908
beam power amplifier working model

beam power amplifier working model

Robert Forsberg
1943
beam power tetrode

beam power tetrode

American
circa 1940
box of vacuum tube bridge parts

box of vacuum tube bridge parts

General Radio Company
1950-1960
cathode and broken glass from 6A7E vacuum tube

cathode and broken glass from 6A7E vacuum tube

American
1920-1930
cathode and filament wire from Phil Co 84 vacuum tube

cathode and filament wire from Phil Co 84 vacuum tube

Philadelphia Storage Battery Company
1920-1930
cathode and grid from Eveready Raytheon ER224 vacuum tube

cathode and grid from Eveready Raytheon ER224 vacuum tube

Raytheon Manufacturing Company
1922-1930
cathode, filament, and grid from Raytheon 24A vacuum tube

cathode, filament, and grid from Raytheon 24A vacuum tube

Raytheon Manufacturing Company
1922-1930
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