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Need a Schematic? Check the Vault *MP-1 Classic Schematics Just Added!!

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 1 
 on: Today at 06:05 AM 
Started by Hanneman213 - Last post by Hanneman213
I changed the patch cable ( which I bought new) with my another old one and as yet, I hear no problem. I think, I'm gonna wind around the seller with it.

 2 
 on: Today at 05:17 AM 
Started by van Sinn - Last post by van Sinn
No takers on my suggested use of this pedal?

 3 
 on: Time Format 
Started by DJD100 - Last post by rnolan
Cool, glad you got your needs sorted  :thumb-up: .

 4 
 on: Time Format 
Started by DJD100 - Last post by DJD100
Hey Doug, sorry no one answered your post.  I've never modded my preamps (MP1 or MP2) apart from cap and EPROM changes (hence I didn't reply before).  Kim posted about some of the mods describing what they do/sound like in the "mods" area.  Interesting idea to mod the MP1 ch, I don't know if the circuit they went for is identical to the MP1 or if the original MP1 mods will work quite the same way with it  :dunno: .Anyway, overtaken by events...I set up a board for the MP1 ch a while ago, so feel free to post your experiences with it in there, some members have been thinking of getting one, but they are not cheap, then ADA units never were in their day.

Hi, the tube circuit is identical according to David, and I confirmed that MP-1 Channel's V2 is setup the same as the MP-1 schematic I have, and that was the only stage I was going to mod.

I'm sure the Cathode Follower mod would be great for the distortion channel, but the clean channel will lose gain as well with that mod, so I'm not going to bother as I have picked up a Rocktron Valvesonic Plexi tube preamp for my Marshall needs.

Going forward I will use the ADA MP-1 Channel primarily for it's clean channel, hence I need the gain from it being unmodded.

I am loving the MP-1 Channel, sounds just like my old MP-1 minus the solid state channel and chorus, good deal!

 5 
 on: Time Format 
Started by van Sinn - Last post by van Sinn
Just noticed this pedal, thinking, set to a light distortion, it might be neat for two purposes:
 would be a nice booster for solos
 would create a slightly crunchy/bluesy tone with my MP2 in fat clean mode


 6 
 on: Time Format 
Started by ang3lus - Last post by ang3lus
I have the top switch yes, planning on getting the mdrt, will not change out the rear jack cause i want some old line level rack units there

 7 
 on: Time Format 
Started by ang3lus - Last post by van Sinn
As for transformer, just get the MDRT ;)
More power to the people (can supply more current) and higher plate voltage.

 8 
 on: Time Format 
Started by DJD100 - Last post by rnolan
Hey Doug, sorry no one answered your post.  I've never modded my preamps (MP1 or MP2) apart from cap and EPROM changes (hence I didn't reply before).  Kim posted about some of the mods describing what they do/sound like in the "mods" area.  Interesting idea to mod the MP1 ch, I don't know if the circuit they went for is identical to the MP1 or if the original MP1 mods will work quite the same way with it  :dunno: .Anyway, overtaken by events...I set up a board for the MP1 ch a while ago, so feel free to post your experiences with it in there, some members have been thinking of getting one, but they are not cheap, then ADA units never were in their day.

 9 
 on: Time Format 
Started by ang3lus - Last post by rnolan
Hey A, good to see you posting  :thumb-up: , vans's advice is a good start.  If you need parts MJMP's (our master tech) site is a good source (http://www.marshalljmpmodshop.net/index.htm).Take your time with the various boards and threads, we have accumulated quite a bit of info etc over the years but it's laid out reasonably logically, read the various bits as you need to.First (if you haven't already) download the manual and read it.  Then load the factory presets.  If the battery is dead (and probably is) the programs are lost after power off (so probably the next thing to do).
Does your unit have a top switch to change the output from inst to line level ?  If so the rear (input) jack mod is worth doing (MJMP has all you need for this mostly pre-wired).Battery mod is a must do, or you will loose any program changes when you turn it off  :facepalm: Noise mod(s) deals with quite a few caps that need changing, the noise (from old caps) is most apparent at high gain settings.
Transformer wise you could go with a MDRT or someone may have a spare original 240v tranny.  MJMP gets the MDRTs made from time to time, seems he has some stock at the moment, this will change the sound a bit (plenty of posts about it).The tubes will need changing, lots of posts about tubes, very subjective area as they all sound different, e.g. I changed some Groove Tube 12AX7s for some nice new New Sensor Mullard 12AX7 long plates the other day and they sound sooo much better.  The GTs were very harsh sounding....If you can, run the unit in stereo with stereo power amp and 2 cabs, it sounds much better than mono (not that it sounds bad in mono)When you switch it on it will display the EPROM (firm wear) version. e.g. 1.38, or 2.00, or 2.01 (it's also written on top of the EPROM (front right hand side as you look down with top off)).  MJMP has the 2.01 EPROM (which is the last revision ADA made, includes being able to save and load patches to PC via midi port).  The factory patches are on the EPROM (later versions included additional patches) so you can load them anytime even with a dead battery.As you have already discovered, unused/un-programmed patches default to 0 until you change and store them.Again, welcome to the forum, lots of people here who are happy to help  :wave:

 10 
 on: Time Format 
Started by Hanneman213 - Last post by rnolan
I've had issues in the past with my studio MP2 where I lost a channel (Cab sim outs), the culprit seemed to be one of the push switches, seems they need a clean from time to time.

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