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Tuning Gulbransen Theatrum organ pedal

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    Tuning Gulbransen Theatrum organ pedal

    My organ has the C# pedal of tune. My service manual has the pages covering the pedal circuits missing.
    I have no idea where the adjustment can be made. The description of the organ states that the pedal circuit is independent of the manual circuits.
    As it is a divider system, perhaps a divider on the pedal board is faulty.
    Foster

    #2
    There is no individual pedal note tuning. It's possible that the transistor associated with the C# is not saturating when keyed and introducing a resistance to the voltage divider. If this is the case, the C# would be playing sharp.
    The only tuning is to insure low C and Hi C are in tune.
    Walking bass is separately tuned.
    td

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