Federal Type 57 TRF radio receiver
date: label: date made
content: 1923
name: label: maker
content: Federal Telephone & Telegraph Co.
notes: label: Description (Brief)
content: A metal casing with front panel on which is mounted: a large dial graduated 0 to 100 ("Wave Length"), a small dial graduated 0 to 50 ("Vernier"), a six-contact sweep switch, four rotary switches, and eight binding posts. Stamped on panel: "Federal / Telephone & Telegraph Corp. / Buffalo, N.Y. U.S.A. / Type 57". Unit was tested in 1970s on a 90 volt B-battery and gave "fair" operation.
label: Description (Brief)
content: A broadcast band radio receiver using a Federal #30 radio frequency transformer designed for 275 to 600 meters. Tuning is accomplished through a large control knob with a vernier adjustment for fine tuning. A switch varies the antenna length. Tuned radio frequency (TRF) circuit with one radio frequency stage, a detector, and two stages of audio frequency amplification. Three filament rheostats. An amplification control was used to reduce the signal strength received from so-called blasting local stations. This predated automatic volume control (AVC) devices. Original price was $98.00. References: Federal Bulletin No. 102-W (February 1923), page 3; Langley set index (1923), page 24.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Susan Horle
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.313761
label: catalog number
content: 313761
label: accession number
content: 195337
objectType: label: Object Name
content: Receiver
label: Object Name
content: radio receiver
physicalDescription: label: Measurements
content: overall: 9 3/4 in x 13 in x 10 in; 24.765 cm x 33.02 cm x 25.4 cm