De Forest model P-200 audio amplifier
date: label: date made
content: ca 1919
label: date made
content: 1919
name: label: maker
content: De Forest Radio Telephone & Telegraph Co.
notes: label: Description (Brief)
content: Marked: "Two Step / Audion Amplifier / Type P-200 / De Forest Radio Tel and Tel Co. New York". Unit is a two stage audio amplifier employing De Forest VT triodes using a 40 volt battery for the plate supply. Audio transformers are of the A-200 type and are mounted to prevent field interferences. Three telephone jacks are located near the bottom of the panel for connection to headphones. Varying amplification is then provided, depending on the stage used. The "B"battery is mounted internally, but a large 6 volt storage battery is necessary for the filament supply. Original price: $69.50 without tubes or "A" battery. Reference: De Forest Catalog "C." 1919, page 39.
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.321152
label: catalog number
content: 321552
label: accession number
content: 241556
objectType: label: Object Name
content: radio receiver
label: Object Name
content: audio amplifier
physicalDescription: label: Measurements
content: overall: 12 1/2 in x 9 1/4 in x 7 1/2 in; 31.75 cm x 23.495 cm x 19.05 cm