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Thread: I too exchanged currency for goods

  1. #9


    Join Date: Oct 2008
    Location: Cambridgeshire, UK
    ME: Charvel San Dimas
    MB: Charvel 3b
    Rig: Marshall JVM210H (modded)

    iTrader: 3 (100%)

    Couldn't be anything else really given the bottom edge



    So, my rig is getting there. I did end up getting rid of my Rectifier as it was collecting dust since i modded my JVM (i honestly never saw myself sacking off rectifiers in favour for a Marshall, but here we are...). I felt the money would be better spent on gear I actually need and that would be useful to have. Get a really functional and awesome rig once and for all, rather than tap-dance my way through a set (hence the GSP1101 and foot controller, etc)



    Just missing a 1U power amp now, which is on its way (I snagged a filthy cheap Rocktron Velocity 300, as it's in need of repair)

    For live use I'm only intending to use the GSP1101 for FX, with the JVM as my amp. The JMP-1 + Rocktron will be there simply as a back-up amplifier, should the JVM shit the bed.

    But for recording, the JMP-1 into the JVM's power amp is SUCH a sick lead tone.
    Check it:


    https://www.dropbox.com/s/v1d6vzo1n1...JMP-1.mp3?dl=0

    Rhythms are JVM, solo is JMP-1 into the JVM's power amp.

    The JMP-1 on the whole is really nothing special. It's basically a rack-mounted 8100. Very similar tone, feel, and circuit. It was also released the same year, so it's definitely got that Valvestate series DNA. I've had a ton of early 90's Valvestate stuff, both personally and from customers to repair, and it had that instantly recognisable feel and tone.

    Contrary to most other Marshalls though (and amps in general) OD1 is a more aggressive and percussive voiced overdrive channel, where as OD2 is the more squishy and mid-rangey, although definitely with more gain on tap (OD1 still has more than enough for a good metal rhythm tone though, especially when boosted).

    Even when using the JVM's power amp, flicking between the JMP-1, and then going back through the front of the JVM (so using the JVM wholesale), you can really feel/hear that this is a very static, solid state, kinda meh sounding amp, and the JVM eats it alive with that all-valve roar and grain. But, that's not to say the tones aren't awesome, and that it's not a lot of fun. Perfect for leads for that reason. It's got that 80's tight squish to it, which sits it in a mix (or rather, lets it sit on TOP of a mix, like a good solo should!)
    www.numbskullaudio.com
    Recording. Mixing. Mastering. Editing. Re-Amping.

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  3. #10


    Join Date: Sep 2008
    Location: Woodbridge, VA
    ME: CS USA Soloist 7
    MA: Ovation Elite Standard
    Rig: Mesa Triple Rec

    iTrader: 10 (100%)

    I really need to re-acquire one of these. Good score.

  4. #11


    Join Date: Sep 2008
    Location: Fredericton, New Brunswick, Canada
    ME: KxK BSG7
    Rig: VHT GP3>Axe FX>VHT 2/90/2

    iTrader: 0

    Quote Originally Posted by Mattayus View Post
    Couldn't be anything else really given the bottom edge



    So, my rig is getting there. I did end up getting rid of my Rectifier as it was collecting dust since i modded my JVM (i honestly never saw myself sacking off rectifiers in favour for a Marshall, but here we are...). I felt the money would be better spent on gear I actually need and that would be useful to have. Get a really functional and awesome rig once and for all, rather than tap-dance my way through a set (hence the GSP1101 and foot controller, etc)



    Just missing a 1U power amp now, which is on its way (I snagged a filthy cheap Rocktron Velocity 300, as it's in need of repair)

    For live use I'm only intending to use the GSP1101 for FX, with the JVM as my amp. The JMP-1 + Rocktron will be there simply as a back-up amplifier, should the JVM shit the bed.

    But for recording, the JMP-1 into the JVM's power amp is SUCH a sick lead tone.
    Check it:


    https://www.dropbox.com/s/v1d6vzo1n1...JMP-1.mp3?dl=0

    Rhythms are JVM, solo is JMP-1 into the JVM's power amp.

    The JMP-1 on the whole is really nothing special. It's basically a rack-mounted 8100. Very similar tone, feel, and circuit. It was also released the same year, so it's definitely got that Valvestate series DNA. I've had a ton of early 90's Valvestate stuff, both personally and from customers to repair, and it had that instantly recognisable feel and tone.

    Contrary to most other Marshalls though (and amps in general) OD1 is a more aggressive and percussive voiced overdrive channel, where as OD2 is the more squishy and mid-rangey, although definitely with more gain on tap (OD1 still has more than enough for a good metal rhythm tone though, especially when boosted).

    Even when using the JVM's power amp, flicking between the JMP-1, and then going back through the front of the JVM (so using the JVM wholesale), you can really feel/hear that this is a very static, solid state, kinda meh sounding amp, and the JVM eats it alive with that all-valve roar and grain. But, that's not to say the tones aren't awesome, and that it's not a lot of fun. Perfect for leads for that reason. It's got that 80's tight squish to it, which sits it in a mix (or rather, lets it sit on TOP of a mix, like a good solo should!)
    Someone must have fucked with my JMP-1 before I got it

    I find the opposite for the OD channels, OD2 is more aggressive, OD1 is a bassy, squishy mess. I finally finished with mine, replaced R124 with a 10K cathode resistor and a 1uf bypass cap, I can actually run the gain on 15-16 now and still get some good pinch harmonics.

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  6. #12


    Join Date: Oct 2008
    Location: Cambridgeshire, UK
    ME: Charvel San Dimas
    MB: Charvel 3b
    Rig: Marshall JVM210H (modded)

    iTrader: 3 (100%)

    Quote Originally Posted by JJ Rodriguez View Post
    Someone must have fucked with my JMP-1 before I got it

    I find the opposite for the OD channels, OD2 is more aggressive, OD1 is a bassy, squishy mess. I finally finished with mine, replaced R124 with a 10K cathode resistor and a 1uf bypass cap, I can actually run the gain on 15-16 now and still get some good pinch harmonics.
    Yeah, I'd agree OD1 is more bassy, harder-sounding, less soft, so less conducive to lead tones/playing IMO. IME most amps try to make OD1 like a "crunch/rhythm" channel and OD2 a "lead" channel, but they always get the EQ all wrong, and OD2 ends up being the one everybody uses for a heavy rhythm tone. With this I just feel like it's the complete opposite. Or, rather, that they've actually got the EQ and response right, so OD2 is very lead-like, more fluid and chewy.

    I can't quite read the original schematic I have (it's a blurry scan) What's the original value of R124? 12k2 I think it says? So are you trying to squeeze more gain out of that first gain stage?

  7. #13


    Join Date: Sep 2008
    Location: Fredericton, New Brunswick, Canada
    ME: KxK BSG7
    Rig: VHT GP3>Axe FX>VHT 2/90/2

    iTrader: 0

    Quote Originally Posted by Mattayus View Post
    Yeah, I'd agree OD1 is more bassy, harder-sounding, less soft, so less conducive to lead tones/playing IMO. IME most amps try to make OD1 like a "crunch/rhythm" channel and OD2 a "lead" channel, but they always get the EQ all wrong, and OD2 ends up being the one everybody uses for a heavy rhythm tone. With this I just feel like it's the complete opposite. Or, rather, that they've actually got the EQ and response right, so OD2 is very lead-like, more fluid and chewy.

    I can't quite read the original schematic I have (it's a blurry scan) What's the original value of R124? 12k2 I think it says? So are you trying to squeeze more gain out of that first gain stage?

    Original was 2k2, the schematic I had was a blurry mess as well so I just measured it. There was also no cap on it either.

    I was just trying to eek out a bit more gain, as to get a usable tone (for me) I had to crank the gain all the way to 20. Sure, I could boost it and would normally, but I'm of the mind that I shouldn't have to run anything at 100% for it to be usable for me. It's such a simple mod and I feel like it really made OD2 usable, although I still think OD1 is a flubby pile of hot garbage, OD2 is actually pretty sweet now. I liked the base tone of the thing, just needed a bit more bite and gain.

  8. #14


    Join Date: Oct 2008
    Location: Cambridgeshire, UK
    ME: Charvel San Dimas
    MB: Charvel 3b
    Rig: Marshall JVM210H (modded)

    iTrader: 3 (100%)

    Quote Originally Posted by JJ Rodriguez View Post
    Original was 2k2, the schematic I had was a blurry mess as well so I just measured it. There was also no cap on it either.

    I was just trying to eek out a bit more gain, as to get a usable tone (for me) I had to crank the gain all the way to 20. Sure, I could boost it and would normally, but I'm of the mind that I shouldn't have to run anything at 100% for it to be usable for me. It's such a simple mod and I feel like it really made OD2 usable, although I still think OD1 is a flubby pile of hot garbage, OD2 is actually pretty sweet now. I liked the base tone of the thing, just needed a bit more bite and gain.
    Hmm yeah I agree with you, if something needs to be on 100% to be usable then I just won't use it. But, I think I'm somewhere like 16 on the gain on OD2 with an OD808 up front, but I use OD808's very differently to most people. Basically everything at noon, so you're not adding any real gain to the tone, and can barely tell the difference as you flick the pedal on and off, it's just adding some sizzle and tightening it up. So yeah, 16-18 is comfortable for me without a boost on OD2, so maybe there is something different about yours (or mine!)

    My OD1 is a perfectly usable tone, quite tight. So again, a disparity there. I wonder if yours was "modded" by some hack who's just made everything all off? Or it could just be the natural drift of components, as these are getting pretty old now.

  9. #15


    Join Date: Sep 2008
    Location: Fredericton, New Brunswick, Canada
    ME: KxK BSG7
    Rig: VHT GP3>Axe FX>VHT 2/90/2

    iTrader: 0

    Well being a hack myself and not understanding too much other than high resistance on the cathode making it clip more I couldn't tell you BTW, don't try a 39k on the cathode, that isn't usable. At all

    The way I see it, bumping it up to 10k basically takes it to Marshall spec, I mean that's what they use for a cathode resistor on their high gain amps Maybe my diodes are getting old and fucked up, since that's where a lot of the clipping and initial gain is supposed to come from in the JMP. Then again, I think I recall seeing in a schematic and reading that's the way a lot of Marshalls are.

  10. #16


    Join Date: May 2011
    Location: Wakefield, UK
    ME: Swirley Shirley
    MB: Shine POS
    Rig: SLO & Roadkill 2x12

    iTrader: 2 (100%)

    Quote Originally Posted by JJ Rodriguez View Post
    Well being a hack myself and not understanding too much other than high resistance on the cathode making it clip more I couldn't tell you <img src="https://www.metalguitarist.org/forum/images/smilies/laugh.gif" border="0" alt="" title="Laugh" class="inlineimg" /> BTW, don't try a 39k on the cathode, that isn't usable. At all <img src="https://www.metalguitarist.org/forum/images/smilies/laugh.gif" border="0" alt="" title="Laugh" class="inlineimg" />

    The way I see it, bumping it up to 10k basically takes it to Marshall spec, I mean that's what they use for a cathode resistor on their high gain amps <img src="https://www.metalguitarist.org/forum/images/smilies/laugh.gif" border="0" alt="" title="Laugh" class="inlineimg" /> Maybe my diodes are getting old and fucked up, since that's where a lot of the clipping and initial gain is supposed to come from in the JMP. Then again, I think I recall seeing in a schematic and reading that's the way a lot of Marshalls are.
    A lot of the 90s ones used diode clipping and well all those jcm800s on recordings did too or extra gain stages added which is why a lot of people are disappointed when they try them and they don't sound how they imagined.

    Long time since I've seen a jmp1 schematic but I seem to remember an ic being used for some of the gain too so that might be worth looking into.
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