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ID = 20780
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Double Triode   Frequency converter 
Identical to ECC70 = CV3986
Similar Tubes
Normally replaceable-slightly different:
Other class quality (otherwise equal):

Base Subminiatur-8, with space 1/8, B8D Wires only.
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Specified voltage AND current AC/DC
Dimensions (WHD)
incl. pins / tip
9 x 35 x 10 mm / 0.35 x 1.38 x 0.39 inch
Tube prices 2 Tube prices (visible for members only)
Information source Röhren-Taschen-Tabelle, (Franzis RTT)   
ECC70: AH eigene Sammlung
Alexander Hofer

ECC70: RTT Schwandt
Günther Stabe † 19.8.20

More ...
ECC70: Mullard - original papers
Detlef Narten

More ...

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