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ID = 73539
United States of America (USA)
Brand: Cunningham Inc., E.T.; Harrison (NJ)
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Half-Wave Vacuum Rectifier   Power-supply 
Identical to CX316 = UV216
Similar Tubes
Normally replaceable-slightly different:

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Was used by Radio/TV-reception etc.
Filament Vf 7.5 Volts / If 3.25 Ampere / Direct / Battery =

The C316 rectifier tube was developed by GE alongside the Kenotron UV216 and was available in the middle of 1921. The first RCA catalog, September 1921 advertised the Kenotron UV216. The tube was designed for use with the UV202 and C302 transmitting tubes. The UV216/C316 tubes could operate with 550 volts ac on the anode and supply 20 watts at 350 volts dc.The filament emission was about 100 milliamperes. (Pages 322 and 323 of Tyne refer only to the UV216.)

Dimensions (WHD)
incl. pins / tip
x 137 x 54 mm / x 5.39 x 2.13 inch
Weight 67 g / 2.36 oz
Literature Saga of the Vacuum Tube, Tyne   Page 322 and 323

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