From: rh@8600.edu   
      
   I have a set of 6550 tubes in a music amp that I want to replace - 4 6550   
   tubes.  Can I replace them with ANY 6550 OR KT88's?  I kind of gathered from   
   the forums I've checked that I can, but I want to be certain.   
      
   Also, I'm thinking of getting either the Tung Sol 6550 or the   
   Electro-Harmonix KT88 to replace the current EH 6550's. Are these good   
   choices? Also, what do you think of the Svetlana 6550's - are these OK?   
      
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