3TM mod MP-1 preamp turns off by itself

[MarshallJMP]

Do you have some soldering experience?

[Hamer95USA]

Yes. What do you have in mind? Do you know what's wrong with my 3TM mod MP-1 preamp? Do you have a diagram for me?

                                                                                                                                                 Guitar George

[MarshallJMP]

Well I would start with changing the 3300uF/16V cap (big cap) near the transformer and the 2 diodes (1N4007) next to the 6 pin red connector.

Also check the 78ML05 for cracked solder joints (top and bottom side). Reflow if possible.

[Hamer95USA]

Hey guys,

I've been away from here for awhile dealing with life's issues. I brought my original 3TM Ultra mod MP-1 preamp with issues to the local amp tech 3 months ago and was notified that the motherboard wasn't working properly.
I ended up buying a stock MP-1 preamp from my friend, having my local amp tech swap out the 3TM mod tube circuit board/nose mod/battery holder & battery, v2.01 EEPROM chip, and rear input jack mod to the new stock MP-1 preamp. It now has the 3TM Ultra mods installed! :headbanger:

[Hamer95USA]

https://photos.app.goo.gl/4RgsCxs7zztBaJfP6

  The updated new ADA Depot 3TM "Ultra mod" MP-1 preamp installed into the revamped monster wet/dry/wet guitar rack rig! It is alive!

                                                                                                                   Guitar George

[MarshallJMP]

Ok nice, too bad the other mp-1 wasen't fixed. I'm sure it wasn't a big deal to get it fixed.