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ID = 19887
Tube type:  LOCKED OFF PART (CODE 9) - see in Notes   Detector 
Identical to C-300 = UV200 = C300
First year Dec.1920 Saga of the Vacuum Tube, Tyne Seite 164

Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
Filament Vf 5 Volts / If 1 Ampere / Direct / Battery =

This is just an other way to write the name of the tube C300 - see there.

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Tube prices 1 Tube prices (visible for members only)
Information source - - Manufacturers Literature   1922-1923
C-300: R.O.
Rudolf Osterkamp

C-300: KoBi
Konrad Birkner † 12.08.2014

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C-300: own collection
Peter den Boer

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