Hi there,   
      
   I am looking for advice on something I am doing right now with my Ameritron   
   AL-811H amp.   
      
   The 572 two 572B tube I  had new dropped down in power to 300 Watts.   
      
   DX Engineering will be sending new tubes.   
      
   Currently, I measured the plate current on each tube in the amp.   
      
   I found the following currents of what I put in the amp to achive just 500   
   watts.   
      
   600 ma   
   150 ma   
   85 ma   
   75 ma   
      
   Now, my question is  if One of the tubes fails, can it damage my amp.   
      
   What is my worst case scenario here?   
      
   I think I might keep these tubes in it until the power drops and then out the   
   new ones in.   
      
   73,   
   Alan   
   VY2XU   
      
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