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Double bass transducer problem

Discussion in 'Electronic Repair' started by N_Cook, Jan 10, 2013.

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  1. N_Cook

    N_Cook Guest

    What is the likely cause of this problem.
    Just as well I keep repair records as I met this amp 5 years ago with the
    same untraceable fault. Owner and me had forgotten it re-appeared when he
    used the bass with a different bass amp.
    Previously reported as a fuzzy sound when he used the bass E string. This
    time just playing the F on the bass E string , a rattly buzz, like a spiral
    wound guitar string vibrating against a fret and loss of the actual F note.
    I've not seen the bass or transducer , assuming its a piezo element - make
    Ashworth transducers, what could cause this symptom, disappearing for 4
    years? Both bass and amp have been around the world a few times on cruise
    ships so perhaps excessive heat or humidity
     
  2. Sjouke Burry

    Sjouke Burry Guest

    Input dependend oscillations?
    for retain freguencies and /or source impedances oscillations at certain
    parts of the waveform.
    Sounds just like you described.
    And a change of source will make it appear/disappear.
    Remedy: carefully changing the HF bandwidth a bit, and improve
    dc power decoupling.
    A small cap across inputs also is worth trying.
     
  3. tuinkabouter

    tuinkabouter Guest

    Can he try another bass guitar?
     
  4. N_Cook

    N_Cook Guest

    I'll give him a rubbber doorstop to place under the spike , worth a try
     
  5. N_Cook

    N_Cook Guest

    I'm trying to work out what HF means in terms of 44 to 44 Hz, but as the amp
    is only used with an acoustic bass then a permanent adaption at the input is
    possible
     
  6. N_Cook

    N_Cook Guest

    He was swapping pickup for a gig last night and also another amp and should
    report back today
     
  7. N_Cook

    N_Cook Guest

    I'll ask about battery, my only experience with piezo was a violin
    transducer and no battery with that one
     
  8. N_Cook

    N_Cook Guest

    a&c

    40 to 44 Hz
     
  9. N_Cook

    N_Cook Guest

    It looks as though it was due to owner sticking a bit of plastic tape
    between transducer and the body of the bass, to stop the bridge moving - so
    much for electronic repair
     
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