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Geiger counter tubes

Help!   i have an old Cenco Geiger counter which had a Raytheon CK1021 tube 
inside a protective metal shield on the end of a cable that plugged into two 
machines to count the pulses put out by the tube. (one clicked and the 
other used lignts to show accumulated total count.
      I dropped the probe the other day and the tube now makes strange
rattles and does not work.
      Does anyone know a source to just replace the tube?  this tube is black 
and about the size of a test tube with three pins in the base and a pointed 
end on top that looks like where it was sealed when made.
  any leads would be appreciated.
  James Braunsdorf