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5A/157D

Information - Help 
ID = 29231
       
Country:
Great Britain (UK)
Brand: Standard Telephones and Cables Ltd. (STC); London, Foots Cray
Developer: Mullard Radio Valve Co. Ltd.;  
Tube type:  Vacuum Pentode   Audio Frequency 
  Ca. 1925 up to 1945 very rare. ***
Identical to 5A/157D = EF37A = OM5B = CV358 = CV1056 = EF36 = VT201_GPO = VR56 = NR49 = EF37A

Base Octal (Int.Octal, IO) K8A, USA 1935 Top contact with a cap
Filament Vf 6.3 Volts / If 0.2 Ampere / Indirect / Parallel / series AC/DC
Description

Low hum and low microphony version
Typically Va=250, Vg2=100, -Vg1=2. Ia=3mA, gm=1.8mA/V.

 
Dimensions (WHD)
incl. pins / tip
32 x 100 x mm / 1.26 x 3.94 x inch
Literature Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
 
5a_157d_stc_ii.jpg
5A/157D: My tubes
Anonymous 413 Collector

 
5a_157d_so.png
5A/157D: rtt
Michael Schlör

 

Collection of a member from FIN

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