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CV171 / W21 pentode

Size This valve measures 123x45mm overall and has a B4 base.

This valve is based on the 210VPT or VS2 or 4-pin W21. The CV specification describes it as a Vari-mu tetrode or pentode. The example here is a pentode. The specification states "This valve is standardised for use in certain equipment which can accept these diverse types. It should not, therefore, be used in any new design."

Filament voltage 2V
Filament current 100mA
Max anode voltage 150V
Max screen voltage 60V
Mutual conductance (Va=150, Vg2=60, Vg1=0 to -1V) 1.1mA/V

 

Pin Function
1 Screen grid
2 Control grid
3 Filament and suppressor grid
4 Filament
TC Anode

CV171

Above: CV171; below: W21

W21

W21 donated by Peter Sables

This file was last modified 13:26:25, Thursday September 28, 2006