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Help! Reeds gone flat.

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    Help! Reeds gone flat.

    A friend reported problems with his reed organ and I encountered a problem new to me.
    Two of the bass reeds on the 8' foot Diapason have inexplicably gone a semitone flat. Both the reeds and the channels are clean and are correctly "gapped." The speech also appears compromised, the attack being slow and with less volume than the other reeds near it.

    Am I looking at a flaw in the reed (weakened metal?) or is this likely to be a winding problem? What should I look for and what can I expect to find?
    In the 16' Sub-bass, I found one broken reed and another reed that was a semitone flat. Holding the valve wide open, however, changed nothing.

    Help would be appreciated,
    John

    #2
    John,

    I think you addressed this in your post, but is there debris on those reeds? Shine a flashlight to see if there's something in the cells when you pull the reeds out.

    Michael
    Way too many organs to list, but I do have 5 Allens:
    • MOS-2 Model 505-B / ADC-4300-DK / ADC-5400 / ADC-6000 (Symphony) / ADC-8000DKC
    • Lowrey Heritage (DSO-1)
    • 9 Pump Organs, 1 Pipe Organ & 4 Pianos

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      #3
      John - that's the symptom I suffered on my George Woods. Played perfectly until one day one reed was about a half tone low, with a "weak" sound and change of timbre.

      Nelson Pease diagnosed the problem as a cracked reed. He showed me the crack under a magnifying glass. Fortunately he had a replacement reed for me.
      Tom M.

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        #4
        Thanks Tom.
        Metal fatigue was high on my list of possible culprits. I looked for cracks, but without a magnifier, did not see any.
        It explains why F and G were affected, which get heavily used.
        This forum is a wonderful resource with so many people willing to share their knowledge.
        Again thanks,
        John

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          #5
          I would agree that when the tone goes flat it indicates a slower vibration which could only come from a weaker reed tongue. The effect is the same as lengthening of the tongue. Metal fatique is as mentioned the culprit here. If the tone went up, it could among other things indicate debris on the base of the tongue effectively "shortening" it to sound at a higher pitch. Logic tells my single brain cell that you should start looking for replacements - and check the other reeds that may sound suspect also.
          Sad state of affairs but as a good friend of mine often would say: "anything made by man is guaranteed to fail some time".
          Luck
          Nico
          "Don't make war, make music!" Hammonds, Lowreys, Yamaha's, Gulbransens, Baldwin, Technics, Johannus. Reed organs. Details on request...

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