Hi,   
      
   I put a pair of 572B tubes  in my AL-811 amp and they died.   
      
   One went to a plate current of 600 ma and the other 75 ma.   
      
   Anyways, DX engineering tubes are coming.   
      
   I checked all my 572B tubes one at a time and selected the best I could for   
   the amp. The worst case sceneria was 75 ma.   
      
   Here goes.   
      
   600 ma   
   150 ma   
   85 ma   
   75 ma.   
      
   Am I going to trash my amp or will the output just drop?   
      
   It's holding at 500 watts right now. For 100 watts in.   
      
   So, should I leave well enough alone or should I only the 2 tubes in there as   
   soon as they arrive?   
      
   If one fails short could that take my amp out?   
      
   Best 73,   
   Alan   
   VY2XU   
      
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