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Z220_4pin

Information - Help 
ID = 72066
       
Country:
Great Britain (UK)
Brand: Hivac Ltd.; Harrow-on-the-Hill
Tube type:  Screen-grid Tetrode   Power/Output 
Identical to Z220_4pin
Similar Tubes
Other base:
  Z220

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.2 Ampere / Direct / Battery =
Description

Harries design using critical grid spacing.
gm=2.2mA/V; Po = 750mW.

 
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
 

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