What's wrong with my Blues Jr???

Discussion in 'Amps and Cabs' started by mojocaster.com, Apr 30, 2008.

  1. mojocaster.com

    mojocaster.com Member

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    So I brought my trusty ole Fender Blues Jr. Tweed to a jam last week end.
    And it died.

    More to the point, it would work just fine, and then the volume would decrease fast until there would be no sound left. It would stay like that for a bit, then it would start working again, then the volume would drop down to nothing again.

    Good news is that the jam was at a neighbor's so I just drove home, got my Mini Z head and the 2x12 Avatar cab, and went right back to jammin'

    this Blues Jr. has been with me for close to 10 years. It's got the original tubes, so I am wondering if that's where the problem is.

    Ideas?
     
  2. jivebaby

    jivebaby Member

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    It is the tubes. Check the preamp tubes if you have some lying around.
    But from the sound of it you need to retube the whole amp.
     
  3. mojocaster.com

    mojocaster.com Member

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    Damn. Thanks for the info :)
     
  4. Cue Dog

    Cue Dog Member

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    +1 on the power tubes. Bad preamp tubes usually cause a lot of crackle but not volume loss....
     
  5. Hart Bypass

    Hart Bypass Member

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    Your blues junior is most likely needing all new tubes, both preamp and output tubes. These amps burn out the output tubes before they do preamp tubes unless you put the bias kit in it from billM mods.
     
  6. johnh

    johnh Silver Supporting Member

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    You hear about Pro's carrying spare tubes. I tend to gig with two amps, so if one goes down I still can play with only one.

    I've never had power tubes go down on me, but did once have a preamp valve go so microphonic I just couldn't use my Pro Jnr live, but at least I still had the Blues Jnr so I was fine.
     

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