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HELP - Aguilar db680 - noisy tubes

Discussion in 'Amps [BG]' started by apener, Jan 20, 2014.

  1. apener

    apener Supporting Member

    Joined:
    Jan 25, 2008
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    Hi guys,

    I am having a problem with my Aguilar db680...
    I live in Israel and have switched it to 240V. at first there were no problems but in the last couple of years i am experiencing problems with this unit.

    Theres this "swoosh" noise , hard to explain so i recorded just the noise - attached below.
    I put the gain on max so the it will be easy to hear but also at normal gain it is unusable.
    I turned the knobs which adds more noises at the relevant frequency : Bass , 400 Hz , 1.5kHz, Treble, Bright, Deep ++/+ , and Active/Passive switch.
    NOTICE: there are popping sounds so don't listen to this loudly.

    I have changed all the tubes which didn't help...

    I have contacted Aguilar but because i am far away there was nothing they can do.

    I have serviced this unit before at a very accomplished local tech (http://www.signal-audio.com/index.htm) , but am still suffering from this noise.

    Has anyone any idea what is this noise and how can i fix it ? have anyone encountered this problem before ? would a local tech be able to fix it ? should i just throw this piece of garbage :mad:?

    Attached Files:

  2. OldogNewTrick

    OldogNewTrick

    Joined:
    Dec 28, 2004
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    Yes, most definitely. I'll pm you my address. Will pay for shipping too. :D
  3. apener

    apener Supporting Member

    Joined:
    Jan 25, 2008
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    :D

    OK, but could you send me the phone number of your tech first ?
  4. Pickebass

    Pickebass Supporting Member

    Joined:
    Jul 12, 2004
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    My first guess would be to make sure the tubes are seated correctly. I also wouldn't rule out a bad tube. Sounds like something is losing contact. Also look closely inside to make sure you don't have a loose wire inside.
    Ive used my for 10 years! Just changed tubes about a year ago. Had a similar noise because one of the tubes wasn't seated correctly.
  5. apener

    apener Supporting Member

    Joined:
    Jan 25, 2008
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    Just checked the tubes, they are sitting snuggley ...
    Will try and change them again...

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