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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
Description Thyratron designed to operate as sawtooth generator in the timebase of oscilloscope instruments.
Similar to 885, registered to RCA about two years later. 
Information source - - Manufacturers Literature   
2B4: Tabu Röhren-Codex, 1948
Anonymous 15 Collector

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2B4: Manufacturer's Literature
Emilio Ciardiello

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from Just Qvigstad

Usage in Models 1= 1950??

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

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