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Z21

Information - Help 
ID = 10485
       
Country:
Great Britain (UK)
Brand: MO Valve Co. Ltd.; GB
Tube type:  Vacuum Pentode   RF/IF-Stage 
Identical to Z21

Base British-7-Pin, old (M7A) (Codex=Ero)
Filament Vf 2 Volts / If 0.1 Ampere / Direct / Battery =
Description Also available with a 4 pin base. Short grid base pentode. Va<150, Vs<150. Gm=1.7mA/V at the maximum voltages and Ia=1.7mA with -Vg=0.5. 
Text in other languages (may differ)
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
 
z21_1.jpg
Z21: H.S.
Hermann Scharfetter

 
156_12.png
Z21: Telefunken Werkstattbuch
Wolfgang Bauer

 
z21_data.png
Z21: MARCONI RECEIVING VALVES, LONDON, 1938
Jose Casas-Avalos


from Just Qvigstad

Usage in Models 3= 1939 ; 4= 1940 ; 1= 1948

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):8


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