From: pfjw@aol.com   
      
   On Sunday, February 12, 2017 at 12:54:08 PM UTC-5, Luigi Vogliobene wrote:   
   > Hi to all, I am new in this forum, I own a MingDa MC368BSE audio amplifier   
   and it is time to replace the final tubes, I was suggested to replace the   
   original 4 Jinvina KT90 with a selected quartet of Electro Harmonix KT90EH; I   
   wonder if the BIAS will    
   be OK if not exactely the same (this amp has a fixed BIAS).   
   > Thank you in advance for your kindly replies.   
   > Luigi   
      
   The circuit uses fixed bias but as this is only adjustable using unlabeled   
   internal controls the task is best left to a dealer; the two meters just show   
   the output voltage at the 8ohm loudspeaker sockets.   
   Read more at http://programming4.us/multimedia/16424.aspx#iez9VMGZU4VOilTD.99   
      
   This is what I got from the net. I suggest you find someone specifically   
   familiar with this amp and have them walk you through the bias process.    
      
   Peter Wieck   
   Melrose Park, PA   
      
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