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  • #1

    power transformer M2 / M3

    Hi,

    does anybody know if the power transformers of AO-29 (M3) and AO-14 (M2) are interchangeable?
    Or do they have different specs?

    Greetings
    Christian
    1958 B3, 1960 M3, 1953 M2 converted into M3, 2x Leslie 122, Ventilator II, Viscount Legend Solo
    Tags: ao-14, ao-29, hammond m2, hammond m3, power transformer
  • #2
    A good way to make an educated guess at this is to grab the M series service manual from archive.org, then compare the schematics for the two amps. You want to compare the voltage either immediately before or immediately after the rectifier tube.

    If it's close, you should be okay, provided they are physically about the same size.

    Wes

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    • #3
      Is it the early version of the AO-29 with the field coil output or the later version?
      Hammond B3 (55), B3 (70), B3 (72), B2 (51) conversion, A100 (61) chop, A100 (62), A105 (75), Northern BC (39) empty.
      Pile of Leslies of various flavours, Minimoog, ARP Odyssey, MaxiKorg, Hohner D6, Rhodes 54, Rhodes 73, Wurlitzer A200, Wurlitzer A203W

      Comment

      • #4
        The early version.
        1958 B3, 1960 M3, 1953 M2 converted into M3, 2x Leslie 122, Ventilator II, Viscount Legend Solo

        Comment

        • #5
          Plate voltages are higher in the M3. About 25 volts. Also the M3 requires a higher filament current supply due to the extra tubes. It might work but it will be working past it spec.
          Hammond B3 (55), B3 (70), B3 (72), B2 (51) conversion, A100 (61) chop, A100 (62), A105 (75), Northern BC (39) empty.
          Pile of Leslies of various flavours, Minimoog, ARP Odyssey, MaxiKorg, Hohner D6, Rhodes 54, Rhodes 73, Wurlitzer A200, Wurlitzer A203W

          Comment

          • #6
            Which way are you going? Sounds like the M3 PT would work in an M2 from Richard's description. The upward voltage drift of AC mains for the last 3 decades would probably make up most of the missing 25V. :)

            Wes

            Comment

            • #7
              I was wondering if it would be possible to replace the PT in the AO-29 using the AO-14 PT. But from your answers I conclude that it might not be the best idea :-)
              1958 B3, 1960 M3, 1953 M2 converted into M3, 2x Leslie 122, Ventilator II, Viscount Legend Solo

              Comment

              • #8
                Originally posted by geldo79 View Post
                I was wondering if it would be possible to replace the PT in the AO-29 using the AO-14 PT. But from your answers I conclude that it might not be the best idea :-)

                It could be risky....
                Hammond B3 (55), B3 (70), B3 (72), B2 (51) conversion, A100 (61) chop, A100 (62), A105 (75), Northern BC (39) empty.
                Pile of Leslies of various flavours, Minimoog, ARP Odyssey, MaxiKorg, Hohner D6, Rhodes 54, Rhodes 73, Wurlitzer A200, Wurlitzer A203W

                Comment

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