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CV183 triode

This valve measures 27x8mm overall and has 4 leads

Filament voltage0.625V
Filament current100mA
Anode voltage30V
Grid voltage0
Anode current750µA
Mutual conductance0.6mA/V

(Note: the above figures came attached to the valve on a hand-written note. The valve appears in the 1946 CV Register with no information, and in the 1963 CV Register with no equivalents or other details.)