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ID = 29230
Great Britain (UK)
Brand: Cossor, A.C.; London
Developer: Mullard Radio Valve Co. Ltd.;  
Tube type:  Vacuum Pentode   Audio Frequency 
Identical to OM5B = 5A/157D = CV358 = EF37A
Similar Tubes
Other class quality (otherwise equal):
  EF36 ; OM5

Base Octal (Int.Octal, IO) K8A, USA 1935 Top contact with a cap.
Filament Vf 6.3 Volts / If 0.2 Ampere / Indirect / Specified voltage AND current AC/DC
Description Low hum and low microphony version of the OM5.
Typically Va=250, Vg2=100, -Vg1=2. Ia=3mA, gm=1.8mA/V. 
Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
32 x 100 x mm / 1.26 x 3.94 x inch
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   

om5b_so.png OM5B: rtt
Anonymous 10 Collector

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