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Thread: Aphex Channel noise after warming up

  1. #1
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    Aphex Channel noise after warming up

    Hello everyone -

    I purchase a used Aphex Channel to experiment with and am experiencing noise as the unit warms up. I tried uploading an mp3 of the noise, or lack thereof, right after powering on and then one and two hours later. The upload failed, so below is a dropbox link to the audio file.

    https://www.dropbox.com/s/rtr9ln83sg...ex%20Noise.mp3

    I've swapped cables and inserted a different mic pre-amp and the noise went away. At this point I'm confident the noise is coming from the Aphex Channel or some interaction between it and the other components. Any ideas on troubleshooting this? I'm planning to contact Aphex on Tuesday.

    In case it helps, here is a diagram of the current wiring setup.
    https://www.dropbox.com/s/fdikwyk1u2...o%20Wiring.pdf

    Thanks for any help.
    - Oliver

  2. #2
    Moderator / IAIB Pro Broadcaster mcphillips's Avatar
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    It's really hard to tell, but it could be a power supply issue.
    Please direct all questions for me to the forum so that all can benefit.

  3. #3
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    Anyway to troubleshoot the power supply without opening it up? The Aphex Channel is plugged into my Furman M-8x^2, so power is conditioned.

  4. #4
    Senior Member Linuxcooldude's Avatar
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    Might be a ground loop. I've had a simular situation and used a ground loop isolator to remove it. It also could be a volume or gain turned up too high. Any gain that is too high raises the noise floor of electronic noise that is naturally present in all electronic audio equipment.
    <a href=http://www.justin.tv/linuxcooldude target=_blank>http://www.justin.tv/linuxcooldude</a>

  5. #5
    Senior Member Dan Ortego's Avatar
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    For what its worth I've had good results with Aphex customer/tech support.

    Jace Nuzback
    Product Specialist
    APHEX
    818-767-2929
    jace@aphex.com
    Last edited by Dan Ortego; 08-31-2014 at 02:16 PM.
    My top-secret email address is: DanOrtego {at} gmail

  6. #6
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    If it is ground loop or volume/gain related, would the noise be initially absent and then get noticeable over time without any changes? That's the symptom that is making me think it's internal as the tube and other components warm up. In the event it is a ground loop issue with the symptom I described, which ground loop isolator with XLR connections do you recommend? Thanks.

    Dan - thanks for the contact. I'm crossing my fingers that it can be resolved without costly repair.

  7. #7
    Moderator / IAIB Pro Broadcaster mcphillips's Avatar
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    It doesn't sound like a ground loop to me, but it's not impossible. I'd forgotten that it has a tube. That's a possibility, or it could be the power supply. Again, it's hard to tell without being able to play with it in person.
    Please direct all questions for me to the forum so that all can benefit.

  8. #8
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    Mike - Okay, thanks. I tried adjusting all the settings I could think of to isolate the issue, including turning the input gain all the way and the noise persisted. The one thing that reduced the noise a little was turning off the BB/EQ/AX.

    I opened the chassis and nothing looks bad on the circuit board. I'll contact Aphex and buy a replacement tube to try.

  9. #9
    Moderator / IAIB Pro Broadcaster mcphillips's Avatar
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    I'd ask them about the problem before I ordered a new tube. There could be a known issue with the unit.
    Please direct all questions for me to the forum so that all can benefit.

  10. #10
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    Hi Dan,

    After not hearing back from techsupport@aphex.com this past week, I tried emailing jace@aphex.com and got a bounce notification back. Can you confirm the email address? Thanks.

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