'81 Marshall JCM800 2203 with my own High Gain Mod and 6550s

Discussion in 'Marshall Amps' started by Eddylenz, Oct 9, 2019.

  1. Eddylenz

    Eddylenz Member

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    Hey Guys,

    Like probably all guitarists, I'm obsessed with tone, so a few years ago, I started tinkering in my own amps. I had no idea what I was doing and it sounded like shit.

    Now, a few years later, I'm almost done with my own mod, that's based on a Jose, with lots of changes, except for the push-pull Master Volume. I did a lot of tweaking and think, that I'm pretty much there with this specific mod now. The gain mod itself requires no drilling, the added tube in my amp is for the clean channel that's coming soon.

    I'm still waiting for the parts for the clean channel and the switching.

    What do you think of my mod?



    If you're interested in my mods, you can DM me, or message me on Facebook
    https://www.facebook.com/realEddyLenz/
     
  2. Mitchell Pearrow

    Mitchell Pearrow Well-Known Member

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    That sounds badass bro, nice job.
    Cheers Mitch
     
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  3. Eddylenz

    Eddylenz Member

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    Thanks, Mitch!
     
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  4. Matthews Guitars

    Matthews Guitars Well-Known Member

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    Sounds like quite a number of my favorite 80s hair metal tones. I like it! Good job for sure!
     
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  5. Eddylenz

    Eddylenz Member

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    Thank you! That's exactly what I was going for with this mod :D
     
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  6. Mitchell Pearrow

    Mitchell Pearrow Well-Known Member

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    You my brother have nailed it.
    Thanks for sharing your work brother !
    Cheers Mitch
     
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  7. ampmadscientist

    ampmadscientist Well-Known Member

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    Start the reactor... Free Mars!
    Doesn't sound a lot different from a stock amp.
    Sounds kind of weak and fizzy, no noticeable (or remarkable) sustain.
    I think many people could get better than this by using different preamp tubes in the stock amp.
    Sorry I fail to hear what is supposed to be better about this modification, compared to a stock amp.
    The clean sounds fizzy too...when the guitar is turned down low.
     
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  8. scozz

    scozz Well-Known Member

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    I agree with with @ampmadscientist,....sounds a bit thin,..to my ears it’s needs more mids and low end.

    You’ve got the bass and middle set pretty low so maybe that’s why I’m hearing what I’m hearing.

    You’ve got the preamp set at 7 or so,...and at that high a number it should sound much thicker and heavier imo.

    Sorry, but you did ask!
     
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  9. Eddylenz

    Eddylenz Member

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    The crunch sound, in the beginning, was a bit thin, I give you that.
    If the sounds later in the video sound weak and fizzy to you, then I don't know what to do.
    There's also no way, to get that sound or a better sound with just the stock amp and some different tubes.
     
  10. Eddylenz

    Eddylenz Member

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    Maybe you didn't watch the video long enough to hear the high gain sounds.
    At about 7 minutes is where it's getting heavy.
    In the beginning, I'm in the low gain mode, which was dialed in for a really aggressive sound.
     
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  11. Eddylenz

    Eddylenz Member

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    Maybe these settings are more to your liking. The clean sound is just the volume rolled down on the neck pickup, I'm gonna install the clean channel today.
    https://drive.google.com/open?id=1fBvbfOazDOx3ufrxyDOP8ked7RuQVdc6
     
  12. ampmadscientist

    ampmadscientist Well-Known Member

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    Start the reactor... Free Mars!
    "Anemic..."
     
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  13. MarshallDog

    MarshallDog Well-Known Member Premium Member

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    Not bad Bro! Are you planning on offering this mod to others?
     
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  14. Eddylenz

    Eddylenz Member

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    Thanks! Probably yes, once I'm completely done with it.
     
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  15. JacksonCharvelAddict

    JacksonCharvelAddict Well-Known Member

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    I like your mod. It reminded me of my Silver Jubilee at certain points but seems to be voiced differently. Great work.
     
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  16. Eddylenz

    Eddylenz Member

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    Thank you! You're right. Now that you say it, it does, in some way, remind me of my old Silver Jubilee I had a while back! The circuit is very different from a Jubilee though.
     
  17. MarshallDog

    MarshallDog Well-Known Member Premium Member

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    Cool!!!
     
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  18. JacksonCharvelAddict

    JacksonCharvelAddict Well-Known Member

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    You said it was based on the Jose circuit right? If I remember right the Jubilee has a much more complicated diode network.
     
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  19. Eddylenz

    Eddylenz Member

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    Yeah, that's right.
     
  20. RickyLee

    RickyLee Well-Known Member VIP Member

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    Wow . . . . that was was a great demo. Outstanding clarity all the way around with great bite and perfect amount of sizzle. I could see the master volume was at 2. And then are you engaging a Jose clipper when you pulled out the knob and turned up MV? Is this straight to a cab or any type of attenuator being used?

    I have tried to make the Jose circuit and then the Jose Atomica work in my current project and I am not happy with the circuits I tried. Tweaked them a bit then pretty much gave up on them. Crap, with the tones you are getting there, I am thinking I need to just throw in the towel and give up on this amp tweaking as I just keep chasing my tail around in huge circle and have not gotten anything I am happy with lol.

    Great work once again Eddy!
     
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