Virtual Valve Museum

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CV1256 / NT99 micropup transmitting triode

Size This valve measures 90x50mm overall plus leads.

E1232 is the prototype of this valve. It carries the number E4529 marked on the inside.

See also CV972 which has two CV1256s connected together.

Heater voltage 6.0V
Heater current 6.5A
Average grid voltage -31V
Max peak anode voltage 12kV
Max anode dissipation 150W
Wavelength of operation 50cm
Amplification factor (Va=1kV, Ia=100mA) 22
Cag 8.0pF
Cgc 11.0pF
Cac 2.25pF
CV1256 and NT99 markings
Top quarter view Bottom quarter view