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CV5 mercury vapour rectifier (4049D, made by STC).

The valve measures approx 240x60mm.


Filament voltage 4V
Filament current 11A
Max PIV 20kV
Max peak anode current 5A
Max average anode current 1.25A
Max permissible condensed mercury temperature range 25 to 50 C

This valve is designed to be mounted vertically, base downwards. The condensed mercury temperature is the temperature of the coolest part of the bulb. This should be just above the base. Air should be blown at this part of the bulb to keep the condensed mercury temperature within the specified limits.