Marconi television receiver
Marconi television receiver
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- Description (Brief)
- 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.
- Location
- Currently not on view
- Object Name
- receiver, television
- television receiver
- Date made
- c1937
- date made
- ca 1937
- maker
- Marconi
- Marconi Wireless Telegraph Co. Ltd.
- Measurements
- overall: 17 1/2 in x 23 in x 14 1/2 in; 44.45 cm x 58.42 cm x 36.83 cm
- ID Number
- EM.322482
- catalog number
- 322482
- accession number
- 246349
- Credit Line
- from A. C. Hill
- See more items in
- Work and Industry: Electricity
- Data Source
- National Museum of American History
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