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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)
Was used by Radio/TV-reception etc.
Filament Vf 2.5 Volts / If 1 Ampere / Indirect / Parallel, (AC/DC)
Description

This tube was used in rthe Fada models 171 and 173. These receivers were operating on 110 volts DC. the supressor grid is wired to the center of the filament. Also made by National Union and Tung-Sol

 
Dimensions (WHD)
incl. pins / tip
x 137 x 54 mm / x 5.39 x 2.13 inch
Weight 59 g / 2.08 oz
Information source Taschenbuch zum Röhren-Codex 1948/49   
Tube Lore (II)   Page 31
 
472_4~~3.png
257: Telefunken Werkstattbuch
Wolfgang Bauer

 

from Just Qvigstad

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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