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ID = 82421
Tube type:  Vacuum Pentode   RF/IF-Stage   Controlling (mu) 
Identical to YF183 = 4EH7 = LF183
Similar Tubes
Heater different:
  3EH7 ; 6EH7 ; EF183 ; XF183

Base Noval, 9 pin miniature (USA pico-9) B9A
Filament Vf 4.4 Volts / If 0.45 Ampere / Indirect / Specified current AC/DC ~ = (Series working)
Information source -- Collector info (Sammler)   
YF183: Ebay
Patrice Zeissloff

More ...
YF183: Telefunken Röhrenhandbuch
Wolfgang Bauer


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