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ID = 31151
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Vacuum Pentode   Power/Output 
  Late but no serial production. For instance only development samples. *****
Identical to EL131
First Source (s)
Jun.1958 : - - Manufacturers Literature Mullard Iss 1
Predecessor Tubes EL34  

Base Octal (Int.Octal, IO) K8A, USA 1935
Filament Vf 6.3 Volts / If 1.5 Ampere / Indirect / Specified voltage AC/DC
Description 35W output Pentode.
The characteristics in the advance data sheet arevery close to those of the EL34.
However some maximum ratings are slightly higher than in the EL34 whilst retaining all the basic characteristics.
The data sheet was issued as the EL311, corrected to EL131. 
Dimensions (WHD)
incl. pins / tip
43 x 110 x mm / 1.69 x 4.33 x inch
Information source - - Manufacturers Literature   
EL131: Mullard Handbook
Roy Johnson

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