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M8137 Info
Country:  Great Britain (UK)      Brand:  Mullard Radio Valve Co. Ltd.;  
  Tube type:  Double Triode   Universal 
Tube ID = 27800
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Identical to M8137 = 6057 = CV4004
Similar Tubes ECC83 (other class quality (otherw. equal))   CV492 (other class quality (otherw. equal))  

Base Loctal-9-Pin (B9G)
Was used by Military
Filament -: Indirect / -: Parallel / series AC/DC / If: 0.15 Ampere / Vf 12.6 Volts /
Description Special Quality Version of the ECC83, CV492. Heater centre-tapped for dual voltage operation. 

m8137.jpg
RFJ
Roy Johnson

 
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ARRL Handbook 1972
Michael Schlör

 
m8137_mullard_data_01.png
Mullard - original papers
Wolfgang Romeyke

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M8137    

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