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9A1

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ID = 9549
       
Country:
Great Britain (UK)
Brand: Standard Telephones and Cables Ltd. (STC); London, Foots Cray
Tube type:  Vacuum Pentode   RF/IF-Stage   Controlling (mu) 
Identical to 9A1 = VT126 = CV1690
Similar Tubes
Normally replaceable-slightly different:
  A50M ; AC/VP ; ACVP1 ; CV518 ; MVS/Pen
Other base:
  9A1_5pin
Base British-7-Pin, old (M7A) (Codex=Fco) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AC/DC
Description

Marketed under the Micromesh label. (STC). Variable mu tube

Va <250, Vs <100; gm =4.25mA/V at Ia=5mA.

 
Tube prices 1 Tube prices (visible for members only)
Information source History of the British Radio Valve to 1940   p. 144 & 195
Wireless World (The), London (WW, 79)   November 22, 1935
Babani, International Radio Tube Encyclopaedia
Taschenbuch zum Röhren-Codex 1948/49
158_1.png 9A1: Telefunken Werkstattbuch
Wolfgang Bauer
More ...
Just Qvigstad 		9a1_brimar_radio_valve_manual_1947_48_p1_data_pin.png
9A1: Brimar Valve Manual 1947-8
Adrian Riesen
More ...
Usage in Models 4= 1933 ; 1= 1934
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):5

Collection of

Tomasz Szczesniak (PL)
 
9a1.jpg

9A1
 
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