High pitch whine

Discussion in 'Amp Tech Center' started by Boubou, May 10, 2019.

  1. Boubou

    Boubou Doctor of Teleocity Gold Supporter

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    Hi.
    I have an Orange Rocker 15.
    For a while it has a high pitch whine. Just plug in the guitar and its there, if i unplug the cable from the amp it stops, whatever that means.
    I read that preamp tubes can become microphonic and do that.
    The amp has: Preamp: 3 x ECC83(12AX7), 1 x ECC81(12AT7), Power amp 2 x EL84.
    Can I just buy 1 12AX7 and try it until i find the bad tube?
    Do they need to be matched?
    Or the 3 tubes changed?
    Any other suggestions?
    I am a noob in "tubes".
    So far for me the best option is JJ tubes from Amazon ( I live in Canada)
    Thanks
     
  2. howlin

    howlin Tele-Afflicted

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    Who wants to know?
    The only "high pitch whine" that I know of is, "You never take me shopping".

    Sorry that's all I got . . . :rolleyes:
     
    Boubou and joealso like this.
  3. corliss1

    corliss1 Friend of Leo's Platinum Supporter

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    If the issue only happens when a cable is plugged in you are either:

    -sending in some signal to the amp that shouldn't be there
    or
    -the jack of the amp is allowing signal to come in, possibly not making a good connection.

    If you just have the amp by itself unplugged you can tap each tube to see if that produces a similar sound. That is how you test for microphonics.

    For your other questions, preamp tubes don't need to be matched and you can just replace one at a time.

    If tapping the tubes doesn't work, can you try a different cable/guitar?
     
    Wally likes this.
  4. Boubou

    Boubou Doctor of Teleocity Gold Supporter

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    Tried my Baja Tele and an Epiphone SG, 2 cables, same noise, cleaned the guitar and amp jacks with a Q-tip and alcohol, same for cable connectors, seems pretty quiet now.
    Hopefully thats it.
    Thanks
     
    robrob and corliss1 like this.
  5. schmee

    schmee Poster Extraordinaire

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    I thought that was "the Orange sound" ? :lol:
     
  6. Frank'n'censed

    Frank'n'censed Doctor of Teleocity

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    ”High pitch whine”

    More than a few have been detected in these parts ;)
     
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