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Crate Blue Voodoo

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  • Crate Blue Voodoo

    Working on a BV120 head. Its fighting me every step of the way.....

    All new tubes
    New filter caps

    2 problems, but lets start with the first.--very loud , random ticking sound--like an old typewriter. Its not steady .

    All the noise issues go away when V2 is pulled out.

    with V2 in, the Master volume on ch 2 affects it.

    So im assuming the problem is before v2. Tried different tubes.

    I have video of the ticking sound--i hope someone has heard this before--sorry about the quality.

    Tick Video by solrizzo | Photobucket

  • #2
    How about a schematic???
    "Take two placebos, works twice as well." Enzo

    "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

    "If you're not interested in opinions and the experience of others, why even start a thread?
    You can't just expect consent." Helmholtz

    Comment


    • #3
      i have a paper one here.....yet after searching for 10 minutes now....cant find one online....there are a couple "attached thumbnails" on here if you look...but i cant open them ????
      what a day...

      if i have to ill dig out my scanner and try and upload mine

      Comment


      • #4
        How bout dis one?

        crate_bv120_sm.pdf
        When the going gets weird... The weird turn pro!

        Comment


        • #5
          thats her !!

          anyone watch the video and heard that sound from an amp ?? i havent !

          Comment


          • #6
            Huh?!? I thought I would see something other than standard amplifiers. I was going to blame it on "the digital effects module" or whatever. But I only see regulat silicooties in there. No, I've never heard that before. It may be something to do with the LDR's and/ or their voltage? Try lifting the voltage of any associated LDRs and see if it stops.
            "Take two placebos, works twice as well." Enzo

            "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

            "If you're not interested in opinions and the experience of others, why even start a thread?
            You can't just expect consent." Helmholtz

            Comment


            • #7
              Just sounded like a bad case of the motorboats to me.

              If it is oscillation, pulling V2 breaks the loop. This then would not be a noise being created at some spot, rather it would be feedback between stages, possibly a broken cnnection on a decoupling cap.
              Education is what you're left with after you have forgotten what you have learned.

              Comment


              • #8
                I thought it sounded asymmetrical. Otherwise I might have thought motorboating as well. It IS hard to be certain from the video.
                "Take two placebos, works twice as well." Enzo

                "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

                "If you're not interested in opinions and the experience of others, why even start a thread?
                You can't just expect consent." Helmholtz

                Comment


                • #9
                  well, i just fired it back up and its silent.... i will have to wait until it starts doing it again

                  Comment


                  • #10
                    Originally posted by Chuck H View Post
                    I thought it sounded asymmetrical. Otherwise I might have thought motorboating as well. It IS hard to be certain from the video.
                    its very random--sometimes steady for 1 minute straight, mostly not

                    Comment


                    • #11
                      I will order some new coupling caps, and maybe a couple of those VTL5C6 ? --i did ground the leads of the first 4 and heard no difference in the ticking.... Mouser doesnt seem to have those

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                      • #12
                        I think LDR's are "obsolete" because of RoHS. I've read that in a few places. And their availability is also indicative. Some should be available for an elevated price through NOS vendors for domestic use (USA).
                        "Take two placebos, works twice as well." Enzo

                        "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

                        "If you're not interested in opinions and the experience of others, why even start a thread?
                        You can't just expect consent." Helmholtz

                        Comment


                        • #13
                          following up -- thanks boys-the amp is working great and all the noise is gone. I replaced all the coupling caps before V2 and that fixed it .

                          Comment


                          • #14
                            And the winner IS... ENZO! (bing-bing-bing-bing-bing)
                            "Take two placebos, works twice as well." Enzo

                            "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

                            "If you're not interested in opinions and the experience of others, why even start a thread?
                            You can't just expect consent." Helmholtz

                            Comment


                            • #15
                              That sounds like the same noise I have in my new build.

                              Comment

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