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IRS and Aragon

Discussion in 'Infinity Loudspeakers' started by rxter, Dec 7, 2018.

  1. rxter

    rxter New Member

    Messages:
    5
    New to the forums - hello.

    Recently purchased IRS Sigmas and Aragon 8008 amp to go with. Amp was recently serviced as follows.

    " 2 new transistor
    Repaired relay board
    Readjusted bias and complete checkover"

    This came with a $370 labor charge so 2 hours??

    It sounded find when purchased but has developed a buzz after a short (2-3 minute) warmup. The buzz transfers through to the speakers. I've tried a couple of different configs to see if the input is contributing, but it buzzes with no input connected at all. And I've hooked up a few different speakers to it and the buzz is loud and clear. Any ideas?

    Buzz seems to be coming from the indicated area.

    Thanks
     

    Attached Files:

     

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  2. uvafan420

    uvafan420 LiKe It LoUd

    Messages:
    310
    Welcome. This might help you out http://audiokarma.org/forums/index.php?threads/aragon-4004-mkii-humms.645939/
     
  3. rxter

    rxter New Member

    Messages:
    5
    Thanks 420. This buzz/hum reaches the speakers unfortunately. I called the tech that did the service in July and he suggested trying a non-grounded plug - did not help. He also suggested trying a different circuit in my house so he was focused on the incoming power supply. Unfortunately I do not have a power conditioner to test.
     
  4. uvafan420

    uvafan420 LiKe It LoUd

    Messages:
    310
    Is this hum also coming from the amp itself, and then out to the speakers as well? I would have the bias rechecked, as that is usually the culprit for hum in the transformer etc... A lot of amps require you look at voltages after 1 min from cold start up, 5 min, etc... Something a tech should do that knows those specific amps (a history of working on them). That is what I would do anyways. Or, ask around on the DIY audio sites out there. Lots of them work on Aragon as well.
     
  5. rxter

    rxter New Member

    Messages:
    5
    Yes the hum is from the amp and at the speakers. I'm planning to take it to a local vintage repair shop so they can take a look at it. Other than the hum it works great. Thanks for the responses. I'll post what we learn.
     

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