Marconi television receiver
date: label: Date made
content: c1937
label: date made
content: ca 1937
name: label: maker
content: Marconi
label: maker
content: Marconi Wireless Telegraph Co. Ltd.
notes: label: Description (Brief)
content: Television receiver of the 1937-38 period, used for reception of BBC high definition TV from Alexandra Palace, North London. Unit is identical to model H.M.V. 904. Designed to operate at 240 volts, 50 cycles AC. Set was used during 1939 until outbreak of WWII, overhauled at end of war and used until 1953. Broadcast receiver section operational at time of donation. TV tuning fixed for singled channel in 41 MHz range with sound set for 41.5 MHz. Broadcast radio receiver section covers three bands, 16.5-50 meters, 200-520 meters and 725-2000 meters. Controls for radio include tuning, volume, on-off switch and wave range. TV controls include focus, brilliance, line hold, height and width. Circuit is as follows: (TV and broadcast): pentode radio frequency amplifier, triode-hexode frequency changer, tetrode intermediate frequency amplifier, double diode triode second detector, tetrode output valve. Full wave rectifier. (Supplementary TV stages): tetrode second IF amplifier, tetrode third IF amplifier, tetrode anode bend second detector, sync separator (diode and pentode), two tetrode (triode connected) frame time base valves, two tetrode line time base valves, Half wave EHT rectifier. 4.5" diameter cathode ray tube. Reference: Wireless World (Sept. 1, 1939), page 218-20.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from A. C. Hill
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.322482
label: catalog number
content: 322482
label: accession number
content: 246349
objectType: label: Object Name
content: receiver, television
label: Object Name
content: television receiver
physicalDescription: label: Measurements
content: overall: 17 1/2 in x 23 in x 14 1/2 in; 44.45 cm x 58.42 cm x 36.83 cm