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Z220

Information - Help 
ID = 11860
       
Country:
Great Britain (UK)
Brand: Hivac Ltd.; Harrow-on-the-Hill
Tube type:  Screen-grid Tetrode   Power/Output 
Identical to Z220
Similar Tubes
Normally replaceable-slightly different:
  PM22C
Other base:
  Y220_4pin ; Z220_4pin

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Foo)
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   
Babani, International Radio Tube Encyclopaedia
 
z220a.jpg
Z220: From my own collection
Gerry Howe

 
y220_z220.gif
Z220: Wireless World
David Andrews


from Just Qvigstad

Usage in Models 1= 1936

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1


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