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A100 Frequency 90 and 91.

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  • A100 Frequency 90 and 91.

    Good Morning Everyone.

    This forum has been a wealth of information for me while I have been going through this A100 I purchased. I try to search all questions before asking questions but I cant find any info on this problem.

    My problem is that any time a draw bar is out # 5 through #9, the note that frequency 90 and 91 is associated with seem to be off key or maybe an octave higher.
    Other than that I think I have this thing working pretty good.

    Any suggestions would be greatly appreciated.
    Thanks in advance.

    Jim C

  • #2
    Originally posted by Crewser View Post
    Good Morning Everyone.

    This forum has been a wealth of information for me while I have been going through this A100 I purchased. I try to search all questions before asking questions but I cant find any info on this problem.

    My problem is that any time a draw bar is out # 5 through #9, the note that frequency 90 and 91 is associated with seem to be off key or maybe an octave higher.
    Other than that I think I have this thing working pretty good.

    Any suggestions would be greatly appreciated.
    Thanks in advance.

    Jim C
    This is one of those cases when a short video clip illustrating the issue would be very helpful - it's not easy to comprehend the exact nature of your problem.
    Current organs: AV, M-3, A-100
    Current Leslies: 22H, 122, 770

    Comment


    • #3
      Originally posted by enor View Post
      This is one of those cases when a short video clip illustrating the issue would be very helpful - it's not easy to comprehend the exact nature of your problem.
      Hi Enor

      https://www.youtube.com/watch?v=bFyc85b5Mic

      This link is to a short video of the upper scale with the 4th drawbar out only.

      https://www.youtube.com/watch?v=Se7d5jeYAZ0

      This second link is to a short video of the upper scale with the 7th drawbar out only and the C# and D notes sound distorted seem to go to a higher note when played.

      Jim C

      Comment


      • #4
        Originally posted by Crewser View Post
        Hi Enor

        https://www.youtube.com/watch?v=bFyc85b5Mic

        This link is to a short video of the upper scale with the 4th drawbar out only.

        https://www.youtube.com/watch?v=Se7d5jeYAZ0

        This second link is to a short video of the upper scale with the 7th drawbar out only and the C# and D notes sound distorted seem to go to a higher note when played.

        Jim C
        What you're hearing is called "harmonic foldback". This D key, on drawbar 7, carries frequency #91 on it which is the last frequency in the generator. So, when you continue upwards the organ repeats the frequencies from the octave below. It's a feature, not a bug!

        You'll notice the same thing on the transition between top octave F#/G notes on drawbars 6 and 9 (even two times on #9). And, between B/C on drawbar #8.
        Current organs: AV, M-3, A-100
        Current Leslies: 22H, 122, 770

        Comment


        • #5
          Originally posted by enor View Post
          What you're hearing is called "harmonic foldback". This D key, on drawbar 7, carries frequency #91 on it which is the last frequency in the generator. So, when you continue upwards the organ repeats the frequencies from the octave below. It's a feature, not a bug!

          You'll notice the same thing on the transition between top octave F#/G notes on drawbars 6 and 9 (even two times on #9). And, between B/C on drawbar #8.
          Thanks Enor,

          Guess that's why a could not find anything about it.

          I just know when playing above middle C and with the 9th drawbar out the pitch of the 4th F just seemed over powering and higher than I wanted it to. Guess I can just throttle the 9th drawbar back.

          Thanks Again.

          Jim C

          Comment

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