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ID = 20427
United States of America (USA)
Brand: Common type USA tube/semicond.
Developer: DuMont Labs, Allen B., Inc. 
Tube type:  Gas Triode   Text 
Identical to 2B4
Similar Tubes
Normally replaceable-slightly different:
Other base and other heater:
First Source (s)
02.Jan.1943 : Electron Tube Registration List rec. 315

Base UY-Base, 5 Pins (USA, April 1927)
Was used by Technology / Measurement
Filament Vf 2.5 Volts / If 1.4 Ampere / Indirect

Thyratron designed to operate as sawtooth generator in the timebase of oscilloscope instruments, such as the DuMont type 164 oscilloscope..
Similar to 885, registered to RCA about two years later.

Dimensions (WHD)
incl. pins / tip
x 102 x 38 mm / x 4.02 x 1.50 inch
Weight 37 g / 1.31 oz
Information source - - Manufacturers Literature   
Tube Lore (II)   p. 42
Babani, International Radio Tube Encyclopaedia
Universal Vade-Mecum, Electron Valves and Semiconductor Devices

2b4_sock.png 2B4: Tabu Röhren-Codex, 1948
Anonymous 15 Collector

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Just Qvigstad
2B4: Manufacturer's Literature
Emilio Ciardiello

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Usage in Models 1= 1950??

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1

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