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СО-257so-257

Information - Help 
ID = 10261
       
Country:
Soviet Union
Brand: Common type USSR (SU) tube/semicond.
Tube type:  Vacuum Pentode   RF/IF-Stage 
Identical to СО-257

Base Octal (Int.Octal, IO) K8A, USA 1935 (Codex=Ur) Top contact with a cap
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.25 Ampere / Direct / Battery =
Tube prices 2 Tube prices (visible for members only)
Literature Taschenbuch zum Röhren-Codex 1948/49   
Röhren-Vademacum; P.H. Brans; Antwerpen
 
_so257.jpeg
СО-257: Photo of tube from my collection - TS
Tomasz Szczesniak

 
so257_sock.png
СО-257: Grundig Rö-Tabu, zum M1, Band 3, 1948
Anonymous 15 Collector

 
so257_spec.png
СО-257: Grundig Rö-Tabu, zum M1, Band 3, 1948
Anonymous 15 Collector


Usage in Models 1= 1943 ; 3= 1944 ; 1= 1948

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):5


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