National Radio Tube type 6EX "Rectobulb"
date: label: date made
content: ca 1930
name: label: maker
content: National Radio Tube Company
notes: label: Description (Brief)
content: National Radio Tube type 6EX Rectobulb. Marked: on base: "National / 6EX / Rectobulb". A double-ended rectifier tube with a 4-pin base including filament connections on one end, and a plate lead on top. Unit has a flat metal can-type anode (not mesh). The 6EX may refer to radio station as 6EX listed in San Francisco in 1926. Made by National Radio Tube Company, San Francisco. Reference: Tyne, "Saga of the Vacuum Tube," page 359; and https://www.radiomuseum.org/tubes/tube_r3_rectobulb.html.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: ZZ.RSN79798T21
objectType: label: Object Name
content: Electron Tube
label: Object Name
content: rectifier
physicalDescription: label: Measurements
content: overall: 8 1/2 in x 3 in; 21.59 cm x 7.62 cm