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ID = 55933
United States of America (USA)
Brand: Micamold Radio Corporation; Brooklyn, NY
Tube type:  Current Regulator, Iron in Hydrogen   Power-supply 
  <1925 rare.
Identical to 1A_Amptrol
Similar Tubes
Other base:

Base Edison (candelabra) 12 mm Other combinations of connections.
Was used by Radio/TV-reception etc.
Filament Direct / Battery =
Description Amptrol .25 amp current regulator for use with 5 volt American tubes such as the 201A. Other tubes were made in this series for other tube voltages and currents. Tubes manufactured by Micromold Radio Corporation, Brooklyn New York USA. 
Dimensions (WHD)
incl. pins / tip
12 x 47 x mm / 0.47 x 1.85 x inch
Weight 10 g / 0.35 oz
Information source - - Manufacturers Literature   Undated data sheet for all models.
1A_Amptrol: Fin Stewart collection
Fin Stewart

1A_Amptrol: Fin Stewart collection
Fin Stewart

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