Sterling model R-401 tube tester
date: label: date made
content: 1927
name: label: maker
content: Sterling
notes: label: Description (Brief)
content: Marked: "Sterling / R-401 / Vacuum Tube Tester / Serial No. 7661 / The Sterling Mfg. Co., Cleveland, O. U.S.A." Includes original box, instruction sheet, and an instruction label below unit. This unit is designed to test standard 201-A and 301-A triodes by measuring plate current on a 0-10 milliammeter. Current readings are checked against standard measurements for good tubes on instruction label, and differences noted to indicate efficiency of tube. Test plug and cloth-insulated cord are provided. Original price: $15.00.
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.321494
label: accession number
content: 241556
label: catalog number
content: 321494
label: serial number
content: 7661
objectType: label: Object Name
content: tube tester
physicalDescription: label: Measurements
content: overall: 2 1/4 in x 7 in x 3 7/8 in; 5.715 cm x 17.78 cm x 9.8425 cm