I've had this old 100w JMP MKII head for 15 years, but I don't know the exact year. My tech said it had parts inside stamped from a bunch of years, oldest being 1979.
Serial on the plate front & back says S/A 03245M and the amp name on the back plate is large script like so:
I have a CODE 50, and I'm trying to download the presets that I have chosen in my profile, but I can't download them to the Amp, or to the Gateway app . Pls advise how can I do it.
Many thnx in advance!!
I've noticed that when switching channels, specifically from any other channel to the Clean channel in Green mode, I get an audible pop. Not like a firecracker going off, but definitely bothersome. If I set the Clean channel to Orange mode the pop does not happen. So, the pop only happens when switching to Clean/Green. This pop occurs when switching via the front panel buttons or my midi Voodoo Lab ground Control.
I've had another JVM410H owner try to reproduce the issue, and they experienced the same pop when switching via the front panel buttons, but did not experience the pop when using the Marshall footswitch.
How can I correct this?
What are waiting for a firmware update. I cannot wait so long. It has been more than one year since the latest update.
So i have had this amp since 2016 and i play it a lot. mostly at home on the 5 watt mode. Today as i turned on my rig and put the amp on from stanby(around 20 min) i start playing and the volume starts fluctuating from loud to soft and back on its own. I investigted some patch cables in my pedal board to see if one was faulty and finally just went direct guitar to amp. The fluctuations kept happening. eventually i turned it off and now am writing this!
Now where i live the mains are at 220 and this amp is a US voltage amp so 110. I run it through a power transformer and its worked fine for the last 4 odd years. Never ever had this problem.
Do you guys think a tube is busted? or something else is the culprit. Guitar pots are fine no problem there. the cable and input are all fine. It has to be the amp. Do i need to change out the tubes, have these ones worn out or do you think its my electricity thats irregular?
I connect the head into 2 different 'cabinets' basically 2 combo amps have that im connecting to the speakers of directly. both are at 8 ohm. again, ive run this setup and play almost everyday and this volume thing has never happened.
Any help is much appreciated!
Hi, I have Marshall Mid A.N.C. Тo turn on, I need to hold the button for 8 seconds - is this normal? The instructions say-3 seconds!
Hello I want to exchange valves in my Origin 20h, ordered some aol login from Tube Amp Doctor. After I exchange them do I have to rebias it? Is there a manual for rebiasing? I wasn't able to find anything which would give me even slight bit of a hint about it .
how to upload a preset from MyGateway to the Amp ?
... not to the Gateway library because this will then not be possible to control via footswitch.
there are also patches under marshallcode.tools from where a direct upload to the Amp is possible via USB.
however, not ideal if this would have to be done twice separately (?)
the library overview in MyGateway is ideal but I can´t find a way how to move presets from MyGateway onto the Amp.
Many thanks in advance for your help
-> meanwhile figured it out: drag & drop to Gateway Library, then in the App under the individual Preset, select both Amp + Library, press save.
When I connect my Code 50 to my PC via USB, it only plays the left audio of music but not the right audio. This problem does not persist when connected via Bluetooth to my phone.
I just bought a 100h, honestly without doing any research, wich is my bad. After learning they can only be used with CODE cabs I was a bit suprised, but whatever, one can never have too many stacks. Unfortunately after spending hours searching every music site I know, and a couple new ones I found, it seems there are literally none to be found. This leaves me with a new toy that I can't play with, rather frustrating to say the least. Any Ideas anyone?? Thanks, John M
People here have talked about a "mushy" sound on these amps. It happened to me, at some point, with my DSL 20 head. Fortunately, I also have a DSL20 combo. So I hooked up the combo to the pedalboard and the cab. Unplugged the amp's speaker, and the difference was night and day. I also had a DSL100H, I kept for a friend, same problem. I told him it needed serviced, he didn't listen. I just got done playing one, that was working correctly, at a Guitar Center. It was aggressive, and brutal, the way it should be! Consistent and tight.
What I found on a forum, and what I suspected, was a small capacitor, in the preamp had failed, in C21,C22, position, if I remember correctly. Sorry, but these are made in Vietnam...And that's what you get...Instead of sending my tech guy on a fishing expedition, I'll dump it off somewhere...Maybe, I will get the old JMP I always wanted... DON'T EXPECT THESE AMPS TO LAST, BECAUSE THEY WON'T!
I have an amplifier Code 25,
Tried to find any specification of the installed speaker Y1025J - 02.
The main question for me is:
1) Is the Code25 has the full-range (20-20000Hz)frequency speaker or it a guitar speaker (70-7000Hz)?
2) Can I replace the installed speaker with full-range frequencies (20-20 000Hz) speaker or only the option is do the replacement with specific (I meant for the guitars only) guitar speaker?
I see that is 25w 4ohm speaker, but nothing else to find equivalent for upgrade.
My thoughts are about any speakers, becouse the Code is modeling amplifier and probably the amplifier must produced all frequencies becouse of it. That why I am looking about extra spec information of Code processor working with all audio frequencies and send it to speaker or speaker must be specific as a guutar speaker and cut some unneeded frequencies on speaker level.
I had the opportunity to play on a Spark amp this weekend. They have a really nice app. Do you have any plans on updating your mobile app with more features like Smart Jam?
I have a Marshall Code 50 running MCU version 1.44 and Gateway (Android version 1.5.5) on a Samsung Galaxy S9+ running the latest OS. I can bluetooth pair to the amp and play music, but can not connect to the amp to change my presets from the library. I have reloaded the latest firmware on the amp, deleted and reinstalled the Gateway app, paired and unpaired several times. Nothing seems to work. I even grabbed my old Galaxy S7 Edge phone and that Gateway app on it does the same thing. Does my amp need to be serviced for Bluetooth connectivity?
hi, i got the marshall code 25, it stopped working when i connected it to my laptop right after i updated the firmware, i think there was a problem with the usb cable, now the amp doesn't respond to anything, and no sount comming out of it, i tried to factory reset stiil no responce, when i turn it on, i get on the screen marshall, then B0.6 , M0.0 , D1.1 , then CHK USB, now i was wondering if there is anything i can do to get it to work again just in case if the new usb wont work, please help
Hi, I am trying to find out any more about my JTM45 amp. I have owned this for over 45 years, i have never made any changes to it.
Something that always puzzled me is the lack of any serial number on the rear panel. I cant see why anyone would have made a new chassis, but there are extra unused holes and i can make out where someone has scratched on the type of valves in each position. I am assuming its probably late 1963 as it doesnt have the 'coffin' lable but is a two tone cabinet as per the early kind. Also the knobs are different to others i have seen.
Also i can find no record of the model of speaker cabinet that i assume is also a Marshall cabinet, 2 x 12" speakers. Sadly the original Celestion speakers are long gone (my fault!) I have seen one reference to an extension cabinet or boutique cabinet that looked similar, how ever it looks like the Marshall badge was at an angle on mine, though it was missing when I bought the cabinet.
Any help for the above would be great, many thanks, Martin
Bonjour, l'appli marshall gateway ne fonctionne pas : j'ai toujours le message suivant "context3D not available ! possible reasons: wrong rendermode or missing device support".
J'ai regardé sur le forum du site aux EU, il est préconisé de fermer l'appli, la désinstaller et la réinstaller.
Je n'arrête pas de faire comme ça depuis des jours et cela ne fonctionne toujours pas : j'ai toujours le même message dès l'ouverture de l'appli...
hi i would like to esclude all the digital effekt and use on pedals how can i do it?
Hello All, I need some help!
I bought an Marshall Emberton 2 weeks ago.
When I swiched on it given a wellcome/On sound. Now ther is no sound, but everything else is working perfectly.
Do you have aniy idea/hint What could it happened?