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  • Testing a Crossover

    How do I test my leslie crossover with a multimeter?
    1964 A-122 / 21H
    XK1-C / Neo Ventilator

  • #2
    Others may differ, but I'd say that you can't -- not effectively. Digital multimeter capacitance check functions work well with an ideal capacitor, but if a capacitor has significant ESR, you won't really get an accurate reading. Also, you can't check them without disconnecting something since all four crossover components are connected.
    I'm David. 'Dave' is someone else's name.

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    • #3
      Alright then, appreciate that. Reckon I’ll just replace the thing as it appears to be pretty old.
      1964 A-122 / 21H
      XK1-C / Neo Ventilator

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      • #4
        Chances the inductors are good approach 100%. I recommend just replacing the capacitors.

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        • #5
          I use a Heathkit IT-28 bridge to test the crossover caps while the leads are disconnected. I have yet to test an original crossover that isn't at least 25% over its stated value. Usually the 12.5uf section is between 15-20, and the 7.8 section is at 10 or higher.

          Maybe someday I'll come across one that is still close to its original value, but until then, I always recap with Dayton caps sold by TWG as a kit.

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          • #6
            Thanks Wes and Muckleroy. Appreciate the information.
            1964 A-122 / 21H
            XK1-C / Neo Ventilator

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            • #7
              Muckelroy, by TWG, are you referring to Tone Wheel General? They have a small selection of caps. Not to hijack this thread, but I am curious to know what suppliers you or others would recommend for capacitors to restore amps and crossovers. (I'm restoring a Rodgers 340)
              Eric Mack
              www.ThisOld340.com
              Rodgers 340 S/N 34341
              Los Angeles, CA

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              • #8
                Yes, Tone Wheel General.

                Dayton Audio is the manufacturer of the caps kit he sells. www.partsexpress.com sells them too, as do other places. I'm not sure what your Rodgers 340 has to do with this question, is this a crossover for a Leslie or a crossover for a built-in speaker cab for the Rodgers organ?

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                • #9
                  I will be rebuilding some of the speaker cabs for the 340, so I was curious to learn what sources you use for your components. Thanks for the response.
                  Eric Mack
                  www.ThisOld340.com
                  Rodgers 340 S/N 34341
                  Los Angeles, CA

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                  • #10
                    Issue reconciled. Replaced the caps in the crossover. Muckleroy was spot on!
                    The horn crossover was sitting at 15 on the multimeter. Easy fix, big results. Sounds way better now.
                    1964 A-122 / 21H
                    XK1-C / Neo Ventilator

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