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ID = 20538
Brand: Common type Europe tube/semicond.
Tube type:  Vacuum Pentode   Controlling (mu) 
Identical to EF731 = CV477
Similar Tubes
Normally replaceable-slightly different:
  5899 ; 5900 ; EF71
Different connections:
First Source (s)
Dec.1957 : Funkschau # 23

Base Subminiatur-8, with space 1/8, B8D
Filament Vf 6.3 Volts / If 0.15 Ampere / Indirect / Specified voltage AND current AC/DC
Tube prices 1 Tube prices (visible for members only)
Information source Röhren-Taschen-Tabelle, (Franzis RTT)   
EF731: MR
Malte Rosenbaum

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EF731: RTT Schwandt
Günther Stabe † 19.8.20

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EF731: Mullard - original papers
Wolfgang Romeyke

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from Just Qvigstad

Usage in Models 1= 1957

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1

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