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Test EL34 amp with 6L6s?

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  • Test EL34 amp with 6L6s?

    Hey all, I've got an EL34 jcm 900 sl-x that a haven't really played in a year or so. Just got the call that the band is getting back together, so I fire it up and get to practicing.

    After about a half hour I suddenly lost most of the volume and the amp got very fuzzy. I've got a sneaking suspicion that it's the tubes as they're several years old, so i swapped in a known good set of pre's. That didn't fix the issue. Problem is now I don't have a spare set of EL34s. Can I put a set of 6l6s in temporarily to verify a tube issue? Or will that cause more problems? Or any other ideas what might cause this issue?

    Thanks for any help.

  • #2
    Sounds like a power tube issue
    Originally Posted by Ovid9


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    I can seperate said **************** into the 5 types.

    But ya know what I still got? A bucket of ****************.

    So, yes, you're right by and large.



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    • #3
      DO NOT sub in the 6L6's.
      Gibson Ibanez Diezel / Fender / Dan Hall






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      • #4






        Quote Originally Posted by ~Abstract~
        View Post

        DO NOT sub in the 6L6's.




        That ^. The amp would need modded a bit to properly run 6L6's.
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        • #5
          Eh, figured as much. Guess I need to hunt down some tubes tomorrow and hope for the best.

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          • #6
            Don't hope for the best....do it right to begin with!

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            • #7
              Just throw some rectifier tubes in it. No problem there



              DK'd
              Originally Posted by Jesse G


              EMG's are like McDonald's cheeseburgers of the pickup world

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              • #8






                Quote Originally Posted by DiscoJason
                View Post

                Hey all, I've got an EL34 jcm 900 sl-x that a haven't really played in a year or so. Just got the call that the band is getting back together, so I fire it up and get to practicing.

                After about a half hour I suddenly lost most of the volume and the amp got very fuzzy. I've got a sneaking suspicion that it's the tubes as they're several years old, so i swapped in a known good set of pre's. That didn't fix the issue. Problem is now I don't have a spare set of EL34s. Can I put a set of 6l6s in temporarily to verify a tube issue? Or will that cause more problems? Or any other ideas what might cause this issue?

                Thanks for any help.




                If it is a 100 watt amp, you could try this (In case there's ONE bad tube)



                Tubes seen from above:

                O=tube

                X=empty socket



                Configuration now:

                O-O-O-O

                Try



                O-X-X-O







                Swap out one tube at the time, and see if it changes anything. (So that you've tried all the tubes, but not more than 2 at the time, in the outermost sockets, 1 and 4)

                If you have a 16 ohm cab, use the 8 ohm output while doing this.

                If your cab is 8 ohms, use the 4 ohm output.
                Knut E Evenmo before the great update

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                • #9
                  And I'm talking about the old EL34's here, NOT the 6L6's
                  Knut E Evenmo before the great update

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