Cathode Ray Tube for Television

Cathode Ray Tube for Television

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Description (Brief)
RCA demonstrated electronic television at the 1939 World’s Fair and other manufacturers quickly began to develop products. Allen B. Dumont Laboratories already produced one of the main components, cathode ray tubes or CRTs. Dumont made these tubes for oscilloscopes but understood they would also serve as picture tubes. This tube has a 3.5 inch face with a white phosphor. The clear envelope allows one to see the electron gun mechanism that produces the stream of cathode rays.
Marked: "149" inked on press. Stamped with Dumont maker's stamp and "Globe Television and Phone Corp." Paper label handwritten: "Fil. Current 5.6A Med[?] Elect. -20V Accel. Elect. +840V Accel. Current 250 microamps" Fil = filament, accel = accellerator. Dumont provided tubes for its own sets and for other manufacturers like Globe Television and Phone Corp. of Boston. Globe made mechanical television sets in the early 1930s and presumably was moving into electronic television.
Location
Currently not on view
Object Name
cathode ray tube
television picture tube
date made
ca 1940
maker
DuMont Company
Physical Description
glass (overall material)
metal (overall material)
plastic (overall material)
Measurements
overall: 12 in x 3 1/2 in; 30.48 cm x 8.89 cm
ID Number
EM.328322
catalog number
328322
accession number
270517
Credit Line
from Fairchild Camera and Instrument Corporation, Dumont Laboratories Div., thru Edgar S. Hill
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Work and Industry: Electricity
Communications
American Enterprise
Data Source
National Museum of American History
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