Virtual Valve Museum

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CV521 cold cathode discharge tube

This valve measures 240x30mm overall

Max anode voltage1800V
Max mean anode current100mA
Max value of discharge capacitance10µF
Max frequency of discharge4pps
Trigger voltage20 to 30kV
Ambient temperature range-37 to +140°F

The trigger voltage is provided by, for example a car ignition transformer, the secondary of which is connected to a few turns of bare wire or a metal band around a length not exceeding one inch of the midportion of the tube.

The anode is indicated by a red marker ring

Inside view