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  • Mesa suddenly lost volume

    I was wailing away last night with the band, and suddenly my amp went to a pretty low volume. I could still hear it, but it was much lower than it should have been, and had a harsh sound to it (although I have pretty heavy overdrive. Not smooth drive. Almost staticky harsh).

    I tried different cables, same. Wound up playing on a different amp.

    The tubes are fairly new. Like a year, maybe not even. We do play a couple nights a week, but a year? Seems too soon.

    I looked at the power tubes, and they seems to be looking OK. No obvious weird colors or extra glow going on. Can't really see the preamp tubes.

    Thoughts? I still have older tubes. I replaced them out of being anal about my sound, not because they were going bad, so they should still work. Does it sound like something more critical? Anything I should be worried about?

    Thanks in advance.

  • #2
    Sounds like one or more bad power tubes.

    Which model Mesa?
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    • #3
      It's most likely a preamp tube. Then can fail unexpectedly. Is it a Recto? I would try V3 first. That one always gives me trouble. Certain positions can be hard on preamp tubes, and some brands are less recommended in those positions (like EHX) because of their design. Try some swapping and you'll most likely fix the problem.

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      • #4
        Couple of nights a week for a year is a bit. What kind of amp and how hard (volume) you pushing it?
        http://www.youtube.com/user/primeholy






        Originally Posted by decode6


        Way to go primeholy, you've just killed Independent George.









        Originally Posted by Arpanoid


        I was meditating on the finer things of life and then I realized that PrimeHoly is the god of this forum. For real. no troll.









        Originally Posted by eudaimonia02912


        Just think: There must be thread ideas that pop in Charveldan's head, but which, after some thought, he rejects and decides not to post. Imagine how bizarre those ideas must be, if they don't even meet Charveldan's standards.

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        • #5
          Sounds like a tube issue
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          • #6
            Sounds like a lube issue


            This is a possibility.
            http://www.youtube.com/user/primeholy






            Originally Posted by decode6


            Way to go primeholy, you've just killed Independent George.









            Originally Posted by Arpanoid


            I was meditating on the finer things of life and then I realized that PrimeHoly is the god of this forum. For real. no troll.









            Originally Posted by eudaimonia02912


            Just think: There must be thread ideas that pop in Charveldan's head, but which, after some thought, he rejects and decides not to post. Imagine how bizarre those ideas must be, if they don't even meet Charveldan's standards.

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            • #7
              I had this happen in my Hydra last week. It was V4 in the end, but I don't know what the mesa circuit is like. I would say you should swap pre-amp tubes until you find the culprit, as previously suggested.

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              • #8
                This is almost certainly a tube issue.
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                • #9
                  In spite of all of the aforementioned possibilities, I think it sounds like a problem with one or more tubes.
                  hi

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                  • #10
                    Had a similar problem with my single recto, swapped out a few preamp tubes and things got back to normal.
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                    • #11
                      Did it fix itself? was it sporadic or just a drop, If it is sporadic, It can be a dirty effects loop. I have had it happen a couple of times on my stiletto, It just took a bit of contact cleaner on the cables and inserted them in and out a few times and all was OK? just fyi

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                      • #12
                        Amp model: Mesa Single Recto-verb 1x12 combo.

                        Volume: Hmm. It varies. Its never near the top, but we play in a medium sized rehearsal studio, and occasionally the booze conspires against us and we play louder than we should in that size room. Say half-mast. The gain is pretty much cranked all the time. Also, I suspect that other people in the room occasionally use my amp.

                        The amp didn't fix itself. I turned it off for a while, then gave it another go, and it still had the same issue.

                        Seems like everybody thinks its a tube issue, which makes me feel better, although I was already starting to justify shopping for a new amp...

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                        • #13
                          I believe it may be related to the valves. I'd try swapping them around.
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                          • #14
                            "The gain is pretty much cranked all the time."


                            Turn the gain down dude. Seriously. 5 or 6 should be enough gain with that amp for just about everything. Boost the front end with an OD pedal for more tighness and saturation. Having the gain on 10 all the time will eat up the tubes a little faster.
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                            • #15
                              Gigging a tube amp with one year old tubes, carrying no spare tubes?

                              Tubes go bad. Be prepared.

                              Sounds like a tube issue to me. And if it's not, you could have ascertained that in minutes with a spare tube or two.
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