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CV155 millimicropup triode

Size The glass section measures 54x18mm overall; the metal part is 37mm by 7mm thick.

The prototype of this valve is E1190. See also CV55 which is a lower emission version.

Heater voltage 6.3 to 7.0V
Heater current 2.7A
Max peak anode voltage, 1µs pulse at 400pps 4.75kV
Max anode dissipation 50W
Amplification factor 15
Min operating frequency 25cm
Pulse output per pair at 25cm 40kW
Capacitances
Cag 3.8pF
Cgc 7.3pF
Cac 2.2pF

Markings on the valve are:

CV155, which appears to be on top of CV55

35/60 and 36085W (and 31/72 and 21900W on the second example)

JMC on the glass.

The 35/60 (see the picture at the bottom of this page) indicates the peak emission current (35A) and the cathode current (60mA) at Va=100 and Vg=0. The second valve is marked 31/72 (31A and 72mA)

CV155

Another view

Another CV155

Top quarter view Bottom quarter view

Markings on the second valve