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U3

Information - Help 
ID = 28625
       
Country:
Great Britain (UK)
Brand:
Tube type:  Half-Wave Vacuum Rectifier   Power-supply 
  <1925 very rare. ***
Identical to U3 = AU3_E27
Similar Tubes
Normally replaceable-slightly different:
  AU15

Base Edison big E27 = 27 mm Base on each end.
Filament Vf 5.5 Volts / If 1.5 Ampere / Direct / Battery =
Description

Ua = 100 V, Ia = 37 mA; Uamax = 3000 Volt.
Upper base : single contact Bayonet 22mm. Lower base : Edison E27

Known Manufacturers are Osram and Cossor. Main picture shows the Cossor version. GEC Osram in additional photo.

Stokes shows a picture of an Osram U3 with a giant 4 pin base. However known Osram literature shows it with the Edison Screw base and is equivalent to the Cossor U3.

 
Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
56 x 130 x mm / 2.20 x 5.12 x inch
Weight 50 g / 1.76 oz
Tube prices 2 Tube prices (visible for members only)
Information source 70 Years of Radiotubes and V.   
- - Manufacturers Literature   1924
 
u3.jpg
U3: Fin Stewart collection
Fin Stewart

 
u3_mov_spec.png
U3: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector


from Just Qvigstad

Collection of a member from D

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