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mpi-4

  1. P

    MPI-4 High Voltage Power Supply

    I'm looking to change the high voltage power supply of my mpi-4 as the scope is no longer outputting a display and believe the C301 capacitor has gone faulty which is a .1uf 1000v Sprague black beauty cap it makes a noticable buzzing sound when the unit is turned on. My question is which...
    • PLUTD
    • Thread
    • capacitor high voltage power supply mcintosh mpi-4 oscilloscope power supply
    • Replies: 1
    • Forum: McIntosh Audio
  2. jdsalinger

    My priceless MPI-4

    Last year, a retired neighbor & friend of mine, John, sold me his C 24 and a non-working MPI-4. I recently got the MPI-4 back from Audio Mart ( Kansas City electronics & audio repair ) and it isn't perfect yet, but most of the functions work well enough to use it. Yesterday, I got more of the...
  3. J

    Mcintosh MPI 4 Worth

    How much is a mcintosh mpi 4 scope worth in near mint and fully functioning condition?
  4. jdsalinger

    Help! MPI-4 cathode voltage is -28V

    The CRT on my MPI-4 does not display any trace or dot. I have checked all voltages going to the CRT and all are OK except that I am not getting -1000V after R317 (measured 229K). I only get -28V. I measure at least -1000V ahead of R317 (my multimeter only goes to 1000V). So, the transformer...
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