jmp-1

  1. J

    JPM-1 repair uk

    As title can anyone point me to a good repair place in the uk (preferably the northwest) to get my preamp looked at? I'm afraid it's gonna cost more than just getting another one... Thanks in advance.
  2. mafkiem

    Which amps are the jmp-1 sounds based on?

    Hello Everyone! I have been playing a marshall jmp-1 for about 6 months now and I am having a lot of fun with it. I am trying to figure out which amps the jmp-1 chanels are based on (if any). Or perhaps marshall amps that sound similar. Based on what I could find online: Clean 1 and clean 2...
  3. M

    Origin 50 as Power Amp for JMP-1

    Is it a good idea to use an Origin 50 head as a power amp for a JMP-1? The rack power amps are insanely expensive. Not much choice either. On the other hand, I'm not impressed with the fact that the preamp section will be working idle all the time. No smart biasing like in the DSL40CR either...
  4. rikki_lee2000

    WTB JMP-1 display cover

    I know I’m reaching here... but if anyone has any idea where I can get the black plastic display cover for a JMP-1, I would be forever in your debt. I got a good deal on a JMP-1 but for some reason, at some point someone decided to paint the front black. It looks kinda cool but I would love it...
  5. rikki_lee2000

    Jmp-1 parts

    Hello, I’m new here so please go easy on me for asking stupid questions. I have a JMP-1 preamp that I got for real cheap a while ago. At some point someone painted it black for some reason. I was able to find a faceplate replacement but I’m having no luck tracking down a display insert. I called...
  6. P

    Jmp-1 wont factory reset, midi wont change, cant store patches

    Hi guys. Newbie here with a jmp-1 i just purchased. The data knob works for changing patches, tone control values but here what doesnt work. - i cant do a factory reset (od1+cln1+poweron) : nothing changes - the data knob doesnt change the midi channel - stays at 7 - when trying to save a...
  7. C

    About JMP-1 mods

    Hello from Spain. I want to ask you about a inet place with a recopilation of mods for Marshall's JMP-1. Do u know a place where i can find them? I tried but nothing special ... In fact, im looking for if i can give more gain to valves and take out the diodes from the sound line and make more...
  8. Marc Johnson

    Fractal Audio Axe-Fx

    Despite the significant cost of the Axe-Fx III, I'm pretty sure I'm headed that direction with my rack. To partially fund the endeavor, I'm going to be selling off my JMP-1 and 9100 (frankly, I wont miss the dither on the JMP-1's param knob at all). Having said that, I had a couple of questions...
    • Marc Johnson
    • Thread
    • ax8 axefx fractal jmp-1 kemper modeling amp tube
    • Replies: 16
    • Forum: Other Amps
  9. M

    How true is that JMP-1 only uses one tube at a time?

    Hi, How true is that JMP-1 only uses one tube at a time - one for cleans one for dirt? Can I only swap one if I only use the OD channels - and which one of the two? I've only ever swapped the tubes' places when there was some flanger sound present - got rid of that problem successfully...
  10. M

    OD pedals with same clipping diodes as in the JMP-1

    Hi, I wonder what the specs of the clipping diodes in the JMP-1 are, and whether any particular OD pedal uses the same diodes. The JMP-1 can sound quite modern in the OD2 mode, so I wonder if a pedal with these same diodes can take a classic amp like a 2203x to that modern direction. The...
  11. M

    Can the Low Gain 2203x input acсept a Preamp Out signal?

    Hi, Is it fine to use the Low input of a 2203x to run a JMP-1 into? Or is it too hot of a signal for this input? It accepts all kinds of clean boosts with lots of dB, as far as I'm aware. This way you are getting two Cathode Followers, by the way.
  12. Marc Johnson

    JMP-1 preamp midi issue (not recognizing sysex incoming)

    Right off the bat, I'm thinking its the cable, but before I go hunting another one, I wanted to know if anyone else had this problem and how you solved it. Summary: The JMP-1 will not respond to an incoming MIDI message. software tried: Midi-Ox, JMP-Editor The JMP-1's foot control will...
  13. Marc Johnson

    9100 ... but which outputs?

    Sirs, I have a recently acquired 9100 that I'm setting up to power my 1936 cab in stereo mode. I've done plenty of stereo guitar stuff, but I've never seen an amp with two outputs for the A channel and two outputs for the B channel (I assume Marshall did that so you could use it to power 4 mono...
  14. J

    Convert JMP-1 200v to 100v

    Hello, I live in europe and I have a 220 volt JMP-1 for several years. I was happy with but I need to do some place at home, so I have decided to sell my JMP-1. But I can see that more people are interrested in the US, so I was wondering if I can easely modify the rack to be 110v compliant. I...
  15. L

    Problems With My Marshall Jmp-1

    Hey guys, I have some problems with my JMP-1: - Clean Channel is very quiet (not really audible at max volume) - OD Channel is audible (low volume though) but if I roll the volume knob on my guitar or slighty touch the strings it starts making cracking noises etc. -> Volume is very low in...
  16. D

    What Midi Controller For Jmp-1?

    I'm looking to buy my first MIDI controller and would like advice on choosing one. I just want to control 2 devices, the JMP-1 patches and and the settings on a Digitech MEQ 28. Is there something compact that will get this done? Thanks
  17. D

    Jmp-1 Has Nasty Squeal After Battery Change

    I just replaced the battery on my JMP-1 and "reinitialized" it and now I get a high pitched squeal with no sound whether the guitar is plugged in or just the cable. I saw a video of someone reinitializing a JMP-1 and saw their data panel go blank momentarily when pressing OD1 + Clean1 but mine...
  18. D

    Has Anyone Figured Out What Battery Holder Fits The Jmp-1?

    I opened my JMP-1 that I just bought and noticed the battery looks like the original. Has anyone figured out what battery holder has the right pin arrangement? I'd like to add a battery holder. I could measure the pins and match it up but I'd have to pull the PC board to measure and the amp...
  19. Seventh Son

    Jmp-1 Preamp

    I'm trying to find out whether the JMP-1 preamp has special effects built in, but there isn't much info on that on the Internet. If yes, what effects does it come with?
  20. G

    Open Jmp-1 Chassis

    The volume pot of my old JMP-1 is very scratchy and noisy so I would like to spray some switch cleaner into it. I tried to open the chassis. I have unscrew the 3 rear screws but nothing happened; I also have unscrew the six little screws on the golden edge (top & bottom) but nothing happened: it...

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