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CV15, low power version of the CV1090 micropup without the anode fins and with a bolt-down heatsink for conduction cooling instead.

CV15 end view

CV15 side view

Markings on the valve are 37K, Up-ArrowP on one side of the block, and CV15 stamped on the other.

Filament voltage3.25V
Filament current6.75A
Max anode voltage4kV
Max anode dissipation1W
Amplification factor (at Va=500V, Ia=20mA)15.5
Max operating frequency300MHz
Capacitances
Cag3.7pF
Cgf2.3pF
Caf1.0pF

Cooling should be provided so that the temperature of the anode does not exceed 140C, even if just the filament volts are applied.

 .CV15