From: peterwieck33@gmail.com   
      
   > Anyway, for a pair of restored to stock Dynaco MK lll's & Vlad causing all   
   kinds of chaos & tube inflation, what KT88's or 6550's are out there that can   
   handle a Mk lll reliably?   
      
   At this stage of the game, and assuming you are not looking for NOS, I would   
   start with Jj tubes. I would *AVOID* anything made in China. Matching is a   
   good thing, and technically, you need only match within an amp, not across the   
   two of them, although    
   if you are willing to pay the freight, that is not a bad thing either. The   
   issue is that small differences between the amps more-or-less reduce the   
   benefit of cross-amp matching anyway.  Note also that within a few dozen   
   hours, the tubes will have    
   drifted to some degree as well.    
      
   Install the new tubes. Run the amp for about 10 minutes (ideally with a   
   shorted input). Do the bias.  Repeat every 30 minutes until there are no   
   further changes.    
      
   Note to the rest of the multitude: These are mono amps based on the 6550/KT88   
   output in PP, 6AN8 driver, and 5AR4 rectifier. They are nominally rated at   
   60WPC with a heavy tailwind.  They weigh ~25 pounds, or ~11.5 kg.    
      
   About covers it.   
      
   Peter Wieck   
   Melrose Park, PA    
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)