Summary
AT50 transmitting triode with a plate dissipation of 50 watts. Made by M. O. Valve Co. (G.E.C.), England.
Cathode; probably in excess of 100 watt output power. Filament voltage 8.1 volts, current 2.8 amp.
The AT50 was based on the Marconi-Osram type T50 and produced for the British Army. The prefix 'AT' means that it is an Army Transmitting valve.
Physical Description
Consists of glass envelope with 3 terminal base, and, at other end, a screw terminal for anode. Spring tensioned, directly heated cathode. Spherical glass bulb with two cylindrical necks top and bottom. The top neck carries a metal top cap with a knurled captive nut for connection to the anode. The bottom neck carries a metal shell with three radial metal arms carried by a cylindrical block of insulating material. The radial arms have hook-shaped ends to allow them to be clamped into suitable screw terminals, providing connection to the filament and grid. The exhaust tip is on the side of the spherical part.
More Information
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Collection Names
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Collecting Areas
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Acquisition Information
Donation from Mr Finlayson (Fin) Stewart, 14 Jun 1973
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Manufacturer
Marconi Osram Valve Co, England, Great Britain, 1920-1930
The Marconi Osram Valve Co., Manufacturer, 1920-1930, England -
Inscriptions
On one side of bulb: MANUFACTURED BY/ THE M.O. VALVE CO./G.E.C./MADE IN ENGLAND/ W (Broad Arrow) D. On other side of bulb: A.T. 50/Working filament volts 8 (rather indistinct)/Current 2.8 (very indistinct)
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Brand Names
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Classification
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Category
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Discipline
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Type of item
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Overall Dimensions
185 mm (Length), 75 mm (Outside Diameter)
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Keywords