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Vibrolux Reissue With Fluxuating Reverb Issue

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  • Vibrolux Reissue With Fluxuating Reverb Issue

    A guitarist touring through town called me about a reoccurring reverb issue she's been having. The amp is a Reissue Vibrolux and works fine until she's into her set and cranked up and the reverb starts to sounds like a bouncing spring and then dies eventually before her set is done. The last tech replaced the preamp tubes and said it was good to go. It failed in the exact same way at her gig last night and it will hit my bench tomorrow. I'll check all the usual but what could cause it to fail as the amp gets hot and then return to normal function the next day only to fail again? I'm seeing the amps for the first time.

    Thanks,

    KR Amps
    The bitterness of low quality is remembered
    long after the sweetness of low price has been forgotten.

  • #2
    Exactly what is failing?
    The Reverb or the whole amp?

    Comment


    • #3
      Just the reverb fails. The amp functions fine minus reverb after it gets hot and then the next day after it's cooled down the reverb returns. It sounded fine last night when she dropped it off late last night. I'm going to pull the chassis today and inspect the board and circuit and then get it hot and hope it fails and see what pops up. If it's heat related that would eliminate the tank, and cables as far as I'm thinking and be on the board or in the tranny. I've never seen an intermitten reverb tranny but just maybe.
      The bitterness of low quality is remembered
      long after the sweetness of low price has been forgotten.

      Comment


      • #4
        While it very well may be a heat issue, please do not fixate on that while evaluating the problem.
        Little tidbits like that from the customer can help as well as hinder a repair.

        Comment


        • #5
          Does this amp have a printed circuit board? If it does I'd suspect a bad solder connection on there.
          WARNING! Musical Instrument amplifiers contain lethal voltages and can retain them even when unplugged. Refer service to qualified personnel.
          REMEMBER: Everybody knows that smokin' ain't allowed in school !

          Comment


          • #6
            Yeah, that is far more likely than a thermally bad transformer.

            here is an old trick. The amp chassis will get a lot hotter in the cab than out on your bench. FOld up an old bath towel and cover the chassis with it. I mean fold it to cover the chassis opening, not draped over the sides. We don;t want the tubes burning it. Don't leave the room while doing that. That will keep the heat in the amp. Of course a heat gun is a more efficient way if you have one.

            But as JAzz mentions, don;t fixate on heat.
            Education is what you're left with after you have forgotten what you have learned.

            Comment

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