Is this a mod?

Discussion in 'The Workbench' started by LPMarshall hack, Feb 16, 2020.

  1. LPMarshall hack

    LPMarshall hack Well-Known Member

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    So is this what was done on my amp? What does this mod do?
     
  2. MickeyJ

    MickeyJ Well-Known Member

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    New Religion is like a guru priest dude, he knows plenty of tone secrets, like, tons of tone secrets.
     
  3. ampmadscientist

    ampmadscientist Well-Known Member

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    The board has been modified in several places.
    The pot is not stock. Somebody changed the pot and didn't have the correct one...
    That's not factory.
     
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  4. LPMarshall hack

    LPMarshall hack Well-Known Member

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    And a kick ass guitar player as well
     
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  5. LPMarshall hack

    LPMarshall hack Well-Known Member

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    Wow! I never knew my amp was molested!

    what mods do you see? Any problems?

    the thing sounds great
     
  6. ampmadscientist

    ampmadscientist Well-Known Member

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    It looks like they were trying to boost the low frequencies up.
     
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  7. Matthews Guitars

    Matthews Guitars Well-Known Member

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    That's a pot replacement repair done by someone who had full size pots in stock and didn't feel that it was worth the trouble and effort to order up a pot that was a direct replacement for the original solder-in type.

    It's actually an improvement, and it'd do no harm to replace them all in the same manner.
     
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  8. MickeyJ

    MickeyJ Well-Known Member

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    i just took a quick look at the post, I think you're going to have to ask him, he's pretty friendly bro, just message him, ask him why is a bypass cap on r5 on a jcm900 a good idea.
     
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  9. MickeyJ

    MickeyJ Well-Known Member

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    yeah, New religion plays damn good, I get the feeling he's not even trying. New Religion is the type of guy you wanna go to a bar with. In mexico.
     
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  10. ampmadscientist

    ampmadscientist Well-Known Member

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    The bypass cap on R5 is to increase the low frequencies (it's my modification done by somebody else).
    No I did not do this amp.
     
  11. LPMarshall hack

    LPMarshall hack Well-Known Member

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    You mean you “invented” this mod?
     
  12. MickeyJ

    MickeyJ Well-Known Member

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    The jcm900 is ripe for molestation.
    Mine has a puff daddy oversized Presidential Daytona fly-buy output transformer, more bass, more love. About the size of a 4xkt66 plexi o/t.
     
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  13. LPMarshall hack

    LPMarshall hack Well-Known Member

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    I had a tech (Bob Gjika) go through it several years ago. He put new tubes in and biased it. Found a burnt register and changed it out.

    spunds great! I’ve gigged it for years
     
  14. MickeyJ

    MickeyJ Well-Known Member

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    the pot replacement may be a mod. different value.more range/more of something.
     
  15. ampmadscientist

    ampmadscientist Well-Known Member

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    Yes bypassing R5 was my idea.
     
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  16. LPMarshall hack

    LPMarshall hack Well-Known Member

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    Any other mods or changes you see?
     
  17. LPMarshall hack

    LPMarshall hack Well-Known Member

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    That’s cool! And it’s to boost some lower freqs? Makes it “bassier “?
     
  18. MickeyJ

    MickeyJ Well-Known Member

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    classified ad

    " to the cxxxksxxxxr who modded my fxxxxxg amp, what the fxxx does the cap do over r5, why the fxxx is that pot bigger than the others? Its like one testicle is twice the size of the other you cxxt.
    Man-up and contact me you yellow son a Bxxxx.
    I didn't know you'd molested my amp you cxxt, some weirdoe had to tell me online.
    Talk to me, my cell number is XXXXXXXXX"
     
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  19. LPMarshall hack

    LPMarshall hack Well-Known Member

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    PS: it sounds grrrrrreat!!
     
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  20. MickeyJ

    MickeyJ Well-Known Member

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    yeah, by cutting certain frequencies you boost others. what that mod does precisely is still a mystery, seeing as ampmadscientist told us he designed the mod, he may confirm.
     
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