From: jrr@flippers.com   
      
   I'm trying to find a modern CDS cells to replace these old timers (1982)   
   from the 70s, I did find a catalogue page for these CDS cells, but the   
   details are not as useful to me as perhaps they would be to someone   
   handy with using CDS cells.   
      
   The ratings are:   
   VT212L - 6 R1, 5 R2   
   VT212  - 7.8 R1, 5 R2   
      
   R1 defined as 2fc resistance in K Ohms (tolerance +/- 33.3% @ 2850K Source   
   R2 defined as min dark resistance (Megohms) in 5 sec.   
      
   Having a heck of a time matching these to more modern cds such as   
   carried by DK or Mouser. I tried the NSL-06S53, but its light resistance   
   is too sensitive and nothing else on DK was better.   
      
   Anyone have a VACTEK catalogue who could scan the pages that might help?   
      
   I suspect that PerkinElmer bought out Vactek as they used similar part   
   (VT200x) numbers as early as 2001 that I could find on web.archive.org,   
   but that archive doesn't have the parts books captured.   
      
   Bitsavers doesn't list it, nothing on ebay either...   
      
   Why am I bothering? I have a rifle gallery   
   (http://www.bonanzagallery.com/) that uses flash tubes in the rifles to   
   trip the cds cells in the targets and there are around 70 cds cells. A   
   number of them are failing so I want to replace them with something that   
   will work reliably.   
      
   Thanks as always for your time!   
      
   John :-#)#   
      
      
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