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The Millett Hybrid Maxed - Output Stage
Output Stage > BJT Diamond Buffer

BJT Diamond Buffer
NOTE - Differences from MOSFET version and updates from prototypes:

  • RB12L/R trimmers are 2K ohm
  • QB1L/R JFETs are PN4392
  • RB4L/R, RB5L/R are 100 ohm
  • RB8L/R, RB9L/R are jumpered out
  • Heat sinks can be 1" tall (at builder's discretion)
    •
    NOTE: You must decide which output stage to use - either BJT Diamond Buffer or MOSFET Diamond Buffer. You cannot build both.
    Recommendations for the BJT output transistors can be found in the Bill of Materials

    Also, please refer to user Steinchen's web site for the revMH Diamond Buffers. Most of the recommendations for the BJT output transistors are due to his excellent work and reviews on the original Diamond Buffer boards for the revMH Millett Hybrid.

    The BJT Transistor Diamond Buffer version of the Millett is a proven and fully-vetted design, long before the design of the MAX. For beginners and those desiring the most dependable results, the Diamond Buffer is the first choice for the MAX output stage.
    Manufacturer specification sheets for most of the recommended output transistor complementary pairs are here:
    MJE243/MJE253 2SC3422/2SA1359 2SC2238/2SA968
    2SC3421/2SA1358 2SC5171/2SA1930 2SC2344/2SA1011
    BD137/BD138    
    Data sheets for the complementary small transistor pairs and the input JFET:
    2N5087/2N5088 PN4392  
    file last changed:Sunday, September 7, 2008 7:00:00 AM
    Please contact the MAX webmaster for questions about these web pages.