U.S. Army Signal Corps type I-52 vacuum tube tester
date: label: date made
content: ca 1928
label: date made
content: c 1928
name: label: maker
content: National Electrical Supply Company
notes: label: Description (Brief)
content: Marked: "Signal Corps U.S. Army / Test Set Type 1-52 / Designed at Radio Laboratories / Fort Monmouth, New Jersey / Order No. W-457-SC-740 / Date 5/31/28 / Serial No. 89 / Made by: / National Electric Supply Co. / Washington, D.C." Hinged top cover missing from specimen. Unit is a mutual conductance tube checker with a 3 ma. DC meter. Tubes checked are WD-12 and VT-5 types. Controls include grid current and mutual conductance tests with a scale setting to 500 microhoms. A filament rheostat regulates filament current, and binding posts are provided for plate voltages of 45 and 67 volts, also filament potential of 6 volts. Meter unit is a model 301 Weston.
label: Location
content: Currently not on view
place: label: place made
content: United States: District of Columbia, Washington
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.321206
label: accession number
content: 241556
label: catalog number
content: 321206
objectType: label: Object Name
content: tube tester
physicalDescription: label: Measurements
content: overall: 4 1/4 in x 9 1/4 in x 9 3/4 in; 10.795 cm x 23.495 cm x 24.765 cm