From: none@nowhere.net   
      
   A fellow ham operator is having a problem: every time he transmits with   
   an amplifier in place, he either blows the amplifier fuses and/or   
   destroys the tubes if using the tube unit he has.  He has been keeping   
   drive to the amp as recommended and even has tried low drive first, but   
   once he tries full output on either amp, they go out.  He's tried   
   different antennas but to no avail.  He can run the radio by itself at   
   200 W into any of his antennas with no issues whatsoever (the amp is 500   
   W).  His SWR's have been normal, even at the time the amps stop working.   
   Notice I said amps because the same behavior happens on both of the two   
   amps he owns.   
      
   I've suggested possible RFI issues somehow causing the issue, but this   
   is just a guess.   I'm just as perplexed as he is.   
      
   Any thoughts you have would be welcome and I could run suggestions by him.   
      
   Thanks in advance,   
   Gary   
      
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