Marshall JCM 900 - 2500 Mk III Vs 2500 SL-X

Discussion in 'Marshall Amps' started by Cody Lee Franks, Feb 20, 2020.

  1. Cody Lee Franks

    Cody Lee Franks New Member

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    I've been inquiring about different JCM 900's. Specifically the Dual Master Volume ones.
    I have a 50 watt Mk III, which has the diodes. I love the amp. But I find it seems to handle overdrive pedals harshly sometimes. Would the SL-X be any different? I've never played an SL-X. It being all tube, I'm very intrigued to learn more about it
    Thanks in advance
     
  2. FracStrat

    FracStrat Well-Known Member

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    You have been here 10 Months and Now You Ask ???
     
  3. FracStrat

    FracStrat Well-Known Member

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  4. FracStrat

    FracStrat Well-Known Member

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  5. Buzzard

    Buzzard Well-Known Member

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    There’s tons of info on all the jcm 900 ‘s on here. Especially the sl/x. I have all 3. Not to be a dick but I don’t even respond anymore cause I feel like I’ve repeated the same thing 15 times over. Next we’re gonna get the ol ‘ will my dsl benefit from an upgraded choke and transformer?”!
     
  6. ampmadscientist

    ampmadscientist Well-Known Member

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    It's really that the amp can be modified by subtracting gain from the input stages, several other things. If it's fixed up it can be a pretty good amp.
    If you are using the amp primarily with pedals the 900 series does not take boosters / distortion pedals very well...
    But it can definitely sound good with the internal boost / tube distortion.
     
  7. JCMDOUG

    JCMDOUG Well-Known Member

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    I have both the amps and the MKIII works best if the sensitivity is low or off then adding a pedal in the front. The SLX has all the gain you should ever need also the choice in V1 tubes helps its tone by taking some of the sizzle out of it. both of my amps are not stock and have had 3 to 4 mods. I know its not one of amps to pick from but a 2 channel JVM takes pedals all day long.
     
  8. Grandturk

    Grandturk Active Member

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    My SLX takes overdrive, fuzz and dirt pedals just fine. I typically run both preamp stages around 2-3 o’clock with a tubescreamer to push it over the top. If I need to clean up, I can roll the volume back on the guitar and keep the tubescreamer off.

    when I run a fuzz or a dirt box, I roll the gain down to a relatively clean signal and then use the dirt pedals for distortion or fuzz sound.

    the lack of a dedicated 2nd channel for clean limits the flexibility of the amp.
     
    Gunner64 likes this.
  9. RobS

    RobS Active Member

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    The above is correct pretty much for all 900's

    given they have so much gain on tap you need to run them on the clean side (less gain) if pushing the front end

    a clean boost however works fine at pretty much all gain levels on my 900

    you will read alot of crap about these amps from people who dont know how to run them.....ignore them
     
    Olemancoff and 6550 like this.
  10. LPMarshall hack

    LPMarshall hack Well-Known Member

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    I also keep my MKIII sensitivity completely off. Anything above 7 o’clock on the dial sounds like fuzzy garbage to me. In addition to keeping it off, I’ve been running my OFA modded SD-1 as a clean boost up front. Sounds friggin great! Oh and I also do the FX loop patch thingy.
     
  11. TheLoudness!!

    TheLoudness!! Active Member

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    On the SLX, you talking about the 5881 (6L6 equivalent) or the EL34 based model?? The SLX with 6L6's just wasn't for me, although a friend set one up for KT66's and got good tones from it. I still say the EL34 based ones are ripping amps!

    A shop not too far away had one that he wanted $1500 for. That's just stupid and there are way better options for that kinda coin.
     
    Cody Lee Franks likes this.
  12. Cody Lee Franks

    Cody Lee Franks New Member

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    Yeah I'm referring to the EL-34 ones.
     
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  13. TheLoudness!!

    TheLoudness!! Active Member

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    Nice! If the deal is right, grab it!
     

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