Sterling model R-402 tube tester
date: label: date made
content: ca 1927
name: label: maker
content: Sterling
notes: label: Description (Brief)
content: Marked: "Sterling / R-402 / Vacuum Tube Tester / Serial No. 5764 / The Sterling Mfg. Co., Cleveland, Ohio, U.S.A." Instruction label pasted beneath unit. In original box with instruction sheet. Same as catalog number EM.321946, with the inclusion of two adapter sockets allowing checks of UX-112, CX-112, UX & CX-171, UX & CX-210, UX-120, and CX-220 type tubes in addition to UV-201A, C-300, C-299, WD-12 and C-12 vacuum tubes. Allows for checking tube efficiency by measuring plate current. Comparison against standard readings for good tubes is made from a chart. Filament and plate supply batteries are connected to binding posts on unit. A filament rheostat adjusts voltage to proper value for specific tube. Original price: $25.00. Reference: https://www.radiomuseum.org/r/sterling_r_402r40.html.
label: Location
content: Currently not on view
place: label: place made
content: United States: Ohio, Cleveland
label: place made
content: United States: Ohio, Cleveland
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Franklin Wingard
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.321497
label: accession number
content: 241556
label: catalog number
content: 321497
objectType: label: Object Name
content: tube tester
physicalDescription: label: Measurements
content: overall: 2 3/4 in x 8 1/2 in x 6 7/16 in; 6.985 cm x 21.59 cm x 16.35125 cm