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ID = 21807
Tube type:  Full-Wave Rectifier gas filled   Power-supply 
Identical to 1725A

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 Sidecontact.
Filament Vf 1.9 Volts / If 3.5 Ampere / Direct / Parallel, (AC/DC)
Description Full wave rectifier for use in magnetic chucks; 1.3A. Side M3 screw-type shield contact. The shield must be tied to the cathode via a 10Kohm, 0.5W resistor. 
Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
71 x 135 x mm / 2.80 x 5.31 x inch
Weight 75 g / 2.65 oz
Tube prices 2 Tube prices (visible for members only)
Information source - - Manufacturers Literature   
1725A: my collection
Giuseppe Antonio Tusini

1725A: Röhren-Tabu Lange 1941
Anonymous 15 Collector

1725A: Röhren-Tabu Lange 1941
Anonymous 15 Collector

from Just Qvigstad

Usage in Models 4= 1934??

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

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