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ID = 19496
Great Britain (UK)
Developer: Mullard Radio Valve Co. Ltd.;  
Tube type:  Vacuum Pentode   Audio Frequency 
Identical to EF37A = OM5B = CV358 = 5A/157D = 5A/157D
Similar Tubes
Other class quality (otherwise equal):
  EF36 ; EF37
Different maximum ratings:
Other characteristic (electr. data):
First year 1942 -- Collector info (Sammler)

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 EF37.
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
Tube prices 3 Tube prices (visible for members only)
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   

oc10_1~~2.png EF37A: RTT 1974 (Franzis) 13. Auflage
Martin Renz

Just Qvigstad
EF37A: Mullard Maintenance Manual
Achim Dassow

More ...
Usage in Models 1= 1947?? ; 2= 1950?? ; 1= 1950? ; 1= 1951? ; 1= 1951

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):6

Collection of




EF37A with tubular (straight) bulb

Forum contributions about this tube
Threads: 1 | Posts: 1
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EF37A (EF37A)
Egon Strampe

Aus "radio mentor" 1/50


End of forum contributions about this tube

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