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  07-January-2012 
History of the company that invented and patented the overtone crystal, etch-to-frequency and variable crystals. Source for ads, engineering bulletins, patents and manuals.



 
 2 - Crystal Info Browse Website open in new window
   
  07-January-2012 
A handy historical chart of old crystal holders with dimensions, and suppliers.



 
   
  07-January-2012 
From N6EV. Tube oscillator schematics, and discussion.



 
   
  07-January-2012 
FT243 information compiled by Paul Carreiro, N6EV.



 
   
  07-January-2012 
A useful technical reference page for Crystals.



 
   
  07-January-2012 
WB6SZS, Eugene Rippen's chart for crystal use on the HF, VHF and UHF bands.





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