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ID = 19499
Brand: Métal; France (tubes)
Developer: Métal; France (tubes) 
Tube type:  Triode, vacuum   Universal 
  <1925 rare.
Identical to 6/100 = 6/100Am = 6/100Amp
Similar Tubes
Other base:
First year 1924 Saga of the Vacuum Tube, Tyne page 400, 401

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 4 Volts / If 0.06 Ampere / Direct / Battery =

In 1924 marketet tubes having both a name and a number. This tube: 6/100 Micro-Mètal. Note G-D-E-R etched on tube: Groupement pour le Dèveloppement des Èmissions Radiophoniques (Group for the development of broacasting), which existed from 1924 to 1929. This Organization was formed to give financial assistance to broadcasting stations before they had income from advertising. Funds were raised by a tax on all tubes sold in France - whether domestic foreign. Supporting manufacturers could brand their tubes with this mark.

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Tube prices 1 Tube prices (visible for members only)
Information source Saga of the Vacuum Tube, Tyne   page 400, 401

b4sockel_6.png 6/100: KoBi
Konrad Birkner † 12.08.2014

Just Qvigstad
6/100: own collection
Peter den Boer

More ...
Usage in Models 3= 1927 ; 1= 1928?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):4

Collection of




6/100 mit Keramiksockel, später als der Metallsockel.

6\100 ist eigentlich die richtige Bezeichnung dieser 6/100 mit Metallsockel. Besonderheit an dieser Röhre: Die Heizung wurde durch eine "minimal-invasive-Operation" ersetzt. Siehe Galsveränderung in der optischen Fortsetzung des Systems. Das war die klassische Methode für den Ersatz eines Heizfadens.

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