[TenTec] Source or Substitute for Argonaut 509 Final Transistors PT3647?

[Frank Castelluccio]

Hello to the list,
   
  Does anyone happen to know of a source for the PT3647 final transistor used in the Argonaut 509? Perhaps even a readily available substitute for those transistors?
   
  I can find them all over the web but unfortunately those huge obsolete device clearing houses who bought up all the surplus wont sell me 2 of them. Very frustrating indeed when they all want a minimum of $150-200 dollars per order. 
   
  I have 2 509's here and one needs some work including replacing blown finals, my intent is to fix it up for my nephew who has a budding interest in Amateur radio.
   
  Any suggestions or direction on this would be greatly appreciated.
   
  Frank

 
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