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Musicman HD130 power transformer voltages

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  • Musicman HD130 power transformer voltages

    How many different versions of the hd130 are there?

    Mine has a Hi/low switch and a choke. attached schem and then looking at the amp it appear to be a mix of the 2 schematics . As one has a hi/low switch and no choke and the other has a choke and no hi/low switch.
    I'll get pics of the amp up when i get back from an errand.

    nosaj
    Attached Files
    Last edited by nosaj; 09-04-2021, 10:33 PM.
    soldering stuff that's broken, breaking stuff that works, Yeah!

  • #2
    Ok further inspection shows the last schematic I found the hi/low switch on the schematic.

    On the 2 red wire one goes to standby and the other to D9 D10 I'm getting 262.1 Vac on hi and 175.9 on Low
    The 2 orange wires getting 35.96Vac
    and the 2 heater wires getting 7V

    The secondaries are disconnected for Voltage measurements. Do these seem really low?

    nosaj
    Attached Files
    soldering stuff that's broken, breaking stuff that works, Yeah!

    Comment


    • #3
      Found this on the tube amp Dr site so it looks like PT is ok.

      nosaj
      Secondary:
      285V@600mA Red
      0V Red

      35V@200mA Orange
      0V Orange

      6.3V@7A Green
      0V Green
      soldering stuff that's broken, breaking stuff that works, Yeah!

      Comment

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