ADA Depot Too - A Forum To Support Users of ADA Amplification Gear

Please login or register.

Login with username, password and session length
Advanced search  

News:

Board added for "Routing & Patching" in Lets Get Technical

Pages: [1]   Go Down

Author Topic: No sound on select preset channels and weird output level knob behavior  (Read 334 times)

0 Members and 1 Guest are viewing this topic.

Andrew Smith

  • Newbie
  • *
  • Offline Offline
  • Posts: 2
    • View Profile

ADA MP1 doing some weird things
Played an MP1s for years in my rack rig but not done much repair as the only thing I've ever blow is a fuse. Just received my second MP1 (v1.38) and it has a few weird problems. So far 2 that stand out.

1)   On certain preset channels, the output is non-existent. It seems a bit weird because channels 1 and 2 I get no sound, but 3-4 I get sound, then 5 and 6 no sound, and on it goes in pairs. It doesn’t matter what voicing I put the channel on, I get nothing. (tested using the headphone out and the Out A and B using my Torpedo direct box)

2)   The output is very low coming out of Out A and B until the output Level knob on the front is up near 4 o’clock where it suddenly springs to life for some reason… happens on all the channels with a signal.

Kind of weird. I’ve never had a problem like this with an MP1 before aside from replacing the battery or a tube. The input jack works fine I can get all the peak lights to light with the settings you would expect to peak each section of the pre.

Any suggestions would be really helpful :)
Logged
Current Rig

Line 6 Relay G90 rack=>ADA Mp1 (1.38)=>Echoplex (in FX loop of MP1)=>Peavey 60/60 Power Amp=>original Celestion Greenbacks 25w

MarshallJMP

  • Superhero Member
  • ******
  • Offline Offline
  • Posts: 3623
    • View Profile
    • marshalljmpmodshop.net

When you change voicing the master volume is set to zero, did you check the master volume (not the front vol knob!!)

2 could either a bad pot or a bad cap.
Logged

Andrew Smith

  • Newbie
  • *
  • Offline Offline
  • Posts: 2
    • View Profile

Aha well you've solved the mystery of the beginning channels, so thanks... masters were on 0  :facepalm:

seems channels 70-110 and 112-115 are still being weird, but I only need a couple of banks so all Good :D


As to the Output Level pot. I think it might be dodgy because the unit now only operates when it is full up.

I'll open it up on the weekend and take a look

Thanks :D
Logged
Current Rig

Line 6 Relay G90 rack=>ADA Mp1 (1.38)=>Echoplex (in FX loop of MP1)=>Peavey 60/60 Power Amp=>original Celestion Greenbacks 25w
Pages: [1]   Go Up