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HELP ....SOMEONE HAVE THE ampeg AUB-1 PICKUP DIAGRAM/SCHEMS ????

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  • HELP ....SOMEONE HAVE THE ampeg AUB-1 PICKUP DIAGRAM/SCHEMS ????

    HI ....
    A friend have a AUB-1 ampeg bass ,but the "mistery pickup" not works ,and he not are capable to disarm this...
    someone have some images from this pickup ? ..or a link of the patent, or any diagram to repair this ..?
    [url]WWW.BABYBASSMOG.COM[/url]
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  • #2
    The pickup I think is piezoelectric, not magnetic:
    Piezoelectric Transducers
    For some help, contact:
    Bruce Johnson of Johnson's Extremely Strange Musical Instrument Co., 119 W. Linden Ave, Burbank, CA 91502; (818) 955-8152.

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    • #3
      Originally posted by soundguruman View Post
      The pickup I think is piezoelectric, not magnetic:
      Piezoelectric Transducers
      For some help, contact:
      Bruce Johnson of Johnson's Extremely Strange Musical Instrument Co., 119 W. Linden Ave, Burbank, CA 91502; (818) 955-8152.
      No, it's magnetic. It used a spring steel disk under the bridge with magnets that move in the pickup coils.

      Bruce Johnson has talked about that here and even posted some photos.

      Some relevant threads:

      http://music-electronics-forum.com/t15992/

      Bruce said in this thread:

      The "mystery" pickup in Ampeg's horizontal Scroll Basses (AEB-1 & AUB-1; 1966-1968) uses a single diaphragm. It's about 5" (127mm) square, and has an effective diameter of 4 3/4" (120mm). It's made of 2 layers of 0.030" spring steel.

      On your magnet and coil designs, just don't go too far trying to make them powerful. If you create too large of a signal level, the amp is going to clip and distort. And to properly load the amp, the coils should have a resistance in the range of 5K to 10K ohms.

      Just to give you a reference point, the system in my AUB-2 Scroll Basses has two coils with a total of 10K ohms resistance, and two 1/4" x 3/4" Alnico V magnets that move within the coils. That gives plenty of signal level in a passive circuit. So, don't go crazy adding magnets! I really doubt that you'll need the stationary magnets that you have shown in your drawings. The moving magnets, particularly neo's, should have all the field strength that you need.
      http://music-electronics-forum.com/t10435/
      It would be possible to describe everything scientifically, but it would make no sense; it would be without meaning, as if you described a Beethoven symphony as a variation of wave pressure. — Albert Einstein


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