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Ampeg SVT pro 3

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  • Ampeg SVT pro 3

    I was playing my bass a few nights ago and all was well and all of a sudden, I accidently pressed one of the gain brigth button and I got a real loud noise. Now, I get no gain from the head. I don't even get any sound from my speakers. I have a Genz Benz 410 and one 15 inch Ashdown. I have no spare head to test my speakers to determine if they are blown or if the problem is with the ampeg head. Any help would be appreciated before I am off to repair shop. Thanks

  • #2
    SVT 3

    Do you have any spare 12AX7 tubes.
    You may have popped V2 or V3.
    Attached Files

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    • #3
      Could it have been that MUTE switch? It doesn't seem that a bright switch would have that effect on an amp.
      Now Trending: China has found a way to turn stupidity into money!

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      • #4
        I checked the mute button but still no sound. I also checked my BASS into another amp and I am not getting any sound after changing the battery. Whatever happened, now my BASS is not working either.

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        • #5
          No i dont have any tubes but I will try to purchase some. Can you purchase these tubes at any electronics store? Thanks

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          • #6
            Hot input

            Something took out the active bass circuit.
            Before doing anything else, can you hook up a DVM to the input jack.
            Insert a known good instrument cable into the input jack.
            Measure across the tip & the ring of the cable.
            Set the DVM on Vdc, then Vac.
            Tells us what you read. DC & AC.
            There may be nothing there at all.
            The voltage path may have been V1a Plate to Grid, internal tube short.
            In that case you may have had 150 Vdc, through a 68K resistor, to your bass input.

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            • #7
              Thanks Jazz P but what is a DVM? Is that a switch or cable? I guess I am not much of an electronics person but I am beginning to learn. Google, here I come. Thanks..
              Is that a 5 or 6 string Bass in your profile. I like the color.

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              • #8
                DVM

                Digital Volt Meter.
                Does not have to be digital.
                Just a term that is used.

                That is a pearl white 1987 Fender jazz p bass special. 4 string.
                At least until the bar smoke changed the color.
                Love it.

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                • #9
                  Okay. I will go purchase one and let you know my findings. Hopefully, I can get this rig together b/c i am missing it right now.

                  Do you prefer the 4 string over the 5 string?

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                  • #10
                    Bass strings

                    I prefer 4 strings.
                    I run a lower gauge on the E string just to get rid of boom.
                    Some of the clubs we play are small.
                    I would imagine being able to drop down to the 5th string would come in handy, I just do not feel like buying another bass.

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                    • #11
                      Did you check the amp with another bass or signal source? Maybe the amp is fine, and only your bass is broken.

                      Better use a passive one in case the amp somehow turned into an active bass killer I've never heard of that happen until JPB suggested it.

                      Also try different cables.

                      5 strings are unnatural
                      "Enzo, I see that you replied parasitic oscillations. Is that a hypothesis? Or is that your amazing metal band I should check out?"

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                      • #12
                        Bass

                        Preferably a Nonactive one.

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                        • #13
                          Thanks Steve for your input. Yes, I have tried another Bass and still no sound from the amp as well as the speaker.

                          I take it you are a 4 string player as well. I too love the 4 strings but also like the 5 strings.

                          Jimmy

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                          • #14
                            I love the 4 strings especially since I am getting back into playing more b/c I am more accurate with the 4 string. I mostly play the 5 string Bass trying to get a feel for it and I was coming along very well until now. Now, I ahve nothing to play with and I am bored. Can't wait to get this amp working.

                            Jimmy

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                            • #15
                              That's interesting. It may be a good idea to install an input cap on the amp if you're using an active bass (or if you have scratchy pots on your instrument. )

                              - Scott

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