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• RE: SET and PSET with 6S33S - Caucasian Blackplate 07:48:54 05/08/15 (2)
  In Reply to: RE: SET and PSET with 6S33S posted by mstolpner@gmail.com on May 07, 2015 at 20:53:50

  The trim pot adjusts the current across that 12K resistor to set the bias. If you ground the input, the current through that resistor is now fixed, and no longer dependent on the trim pot.
  

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  • RE: SET and PSET with 6S33S - mstolpner@gmail.com 08:23:00 05/08/15 (1)
    In Reply to: RE: SET and PSET with 6S33S posted by Caucasian Blackplate on May 08, 2015 at 07:48:54

    This trim pot is used to set 0V on the input. You can change the 12.1K resistor to adjust the bias if needed.
    

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    • RE: SET and PSET with 6S33S - Caucasian Blackplate 09:45:51 05/08/15 (0)
      In Reply to: RE: SET and PSET with 6S33S posted by mstolpner@gmail.com on May 08, 2015 at 08:23:00

      Yes, and if you have an output transformer with a low impedance secondary feeding the input of the amplifier, the trim pot will no longer function. You will indeed have to change the 12K resistor to get the correct bias.
      

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