Sterling model R-511 vacuum tube tester
date: label: date made
content: ca 1930
name: label: maker
content: Sterling
notes: label: Description (Brief)
content: Marked: "Sterling Type R-511 / Tester for AC & DC Tubes / & DC tube reactivator. / A.C. Volts 115 Cycles 50 / Serial No. ____ / The Sterling Mfg. Co., Cleveland, Ohio, U.S.A." Tube tester for the following types: 199, 120, 200-A, 201-A, 222, 224, 226, 227, 245,250, 112-A, 171-A, 210, and 240. Panel includes a filament voltage meter and rheostat along with a plate current meter. A selector switch permits choosing filament voltages in the 1-1.5, 2.5-3.5, 5-6, 7-8 and 15-16 volt ranges. Unit tests grids for both standard and screen grid tubes; also emission checks.
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.321395
label: accession number
content: 241556
label: catalog number
content: 321395
objectType: label: Object Name
content: tube tester
physicalDescription: label: Measurements
content: overall: 3 in x 7 in x 10 in; 7.62 cm x 17.78 cm x 25.4 cm