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257

Information - Help 
ID = 9677
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Vacuum Pentode   RF/IF-Stage 
Identical to 257 = 57 = PH257
Similar Tubes
Other shape (e.g. bulb type):
  G-57-S
Normally replaceable-slightly different:
  GA

Base 6-Pin-Base U6A, old, USA (Codex=Kf)
Filament Vf 2.5 Volts / If 1 Ampere / Indirect
Literature Taschenbuch zum Röhren-Codex 1948/49   
 
472_4~~3.png
257: Telefunken Werkstattbuch
Wolfgang Bauer

 

Usage in Models 4= 1932? ; 2= 1932 ; 1= 1933? ; 3= 1933

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):10

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