From: joseph_barrett@sbcglobal.net   
      
   On Fri, 4 Mar 2011 18:55:38 -0500, "Barry"  wrote:   
      
   >"Bitrex"  wrote in message    
   >news:v-KdncsXROY4U_TQnZ2dnUVZ_s0AAAAA@earthlink.com...   
   >> http://cgi.ebay.com/MATCHED-PAIR-NOS-NIB-SYLVANIA-1D21-SN4-TU   
   ES-USA-/190503003630?pt=Vintage_Electronics_R2&hash=item2c5add25ee#ht_900wt_905   
   >>   
   >> What would one use a "matched pair" of neon discharge tubes for,    
   >> exactly? And how would one match them?   
   >>   
   >   
   >Those tubes were used as the flash lamps in early General Radio    
   >Strobotacs.  Matching them means different things depending on the    
   >application - equal light output, equal breakover voltage, equal    
   >discharge voltage, etc.   
   >   
   >    73, Dr. Barry L. Ornitz     WA4VZQ    
   >   
   Garbage.  1D21 is a thyratron, not a flashtube.  Read the link or look at   
   the photo, then look up 1D21 and thyratron.   
      
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