From: lvogliobene@gmail.com   
      
   Il giorno lunedì 13 febbraio 2017 13:20:07 UTC+1, Peter Wieck ha scritto:   
   > 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   
      
   Thank you, Peter.   
      
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