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257

Information - Help 
ID = 9677
       
Country:
United States of America (USA)
Brand: Tung-Sol Electric Inc.; Newark (NJ)
Tube type:  Vacuum Pentode   Power/Output 
Identical to 257
Similar Tubes
Normally replaceable-slightly different:
  GA

Base UY-Base, 5 Pins (USA, April 1927) (Codex=Kf)
Was used by Radio/TV-reception etc.
Filament Vf 5 Volts / If 0.3 Ampere / Indirect / Specified voltage AC/DC
Description

Developed by Tung-Sol as a DC power amplifier. This tube was used in the 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.

 
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
 
451_1~~2.png
257: Telefunken Werkstattbuch
Wolfgang Bauer

More ...
 

from Just Qvigstad

Usage in Models 6= 1932? ; 2= 1932 ; 1= 1933? ; 1= 1933

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

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