Virtual Valve Museum

Virtual Valve Museum

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CV2247 GM tube

Size This tube measures 125x32mm overall

This GM tube was used in the British Contamination Meter, No. 1.

Threshold voltage (at 20°C)315 to 375V
Operating voltage (at 20°C)355 to 415V
Plateau slope (per volt)0.07% av, 0.15% max
Plateau length150V av, 90V min
Operating temperature range-55 to +50°C
Useful life>109 counts