Radio Specialty Shop type 221 radio frequency amplifier
date: label: date made
content: ca 1922
label: date made
content: ca 1922
name: label: maker
content: Radio Instrument Co.
label: maker
content: Radio Specialty Company
notes: label: Description (Brief)
content: Marked: "Radio Specialty Shop / Oakland, Cal. / Radio Frequency Amplifier / Type 221". Unit employs a 2-stage RF amplifier with a filament rheostat, stabilizer control, tuner and vernier. Binding posts are available on panel for antenna, ground, filament battery, plate batter and output connections. Tubes missing. RF transformer is Type DX-1. Radio Instrument Co., covering 170-450 meters. Branston Type 50 Lateral Wound inductance coil employed.
label: Location
content: Currently not on view
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.320699
label: accession number
content: 241556
label: catalog number
content: 320699
objectType: label: Object Name
content: amplifier
label: Object Name
content: radio amplifier
physicalDescription: label: Measurements
content: overall: 12 1/2 in x 9 in x 8 5/8 in; 31.75 cm x 22.86 cm x 21.9075 cm