Virtual Valve Museum
Virtual Valve Museum | search:
About the museumMuseum exhibitsUpdates, new exhibits etc.EquipmentSupporters
View the guestbookDocumentsValves wanted!Valves for sale or for tradeLinks to other sites, suppliers etc.

GEC CV2138 geiger muller tube

Size This tube measures 70x36mm overall.

This tube is marked No. 8938, Volts 1410, Window weight 7MGm/cm2. Equivalent to GM4 this uses ethyl formate as a quenching agent which gives better plateau characteristics and temperature coefficients.

Plateau length average250V
Plateau slope average0.05%
Operating voltage limits1250 to 1450V
Count life6x10^8
Shileded background counts7 to 15 per minute
Signal output220/100+C (*)
Dead time100&micrp;s
Recovery time250µs

*: C = the total capacitance across the tube in pF

CV2138
Thanks to Roy Johnson for information.

This file was last modified 23:10:50, Friday November 02, 2012