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ID = 52253
United States of America (USA)
Brand: DeForest-Tubes
Developer: Western Electric Company Inc.; New York (NY) 
Tube type:  Triode, vacuum   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to 405D
Similar Tubes
Normally replaceable-slightly different:
  205D ; R205-D

Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
Was used by Industrial
Filament Vf 4.5 Volts / If 1.6 Ampere / Direct / Battery =

De Forest replacement for WE 205D. From 1933, when RCA bought De Forest, also in the RCA Photophone line for maintaining WE sound systems. Not listed for distributor sales.

Source Lud Sibley.

Locking pin rotated 45 deg to prevent damage to other tubes put into the socket.

Dimensions (WHD)
incl. pins / tip
45 x x mm / 1.77 x x inch

Just Qvigstad

Collection of



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