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:

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

Pages: [1]   Go Down

Author Topic: Solid State Clean Gets Nasty  (Read 109 times)

0 Members and 1 Guest are viewing this topic.

Moff40

  • Newbie
  • *
  • Offline Offline
  • Posts: 35
Solid State Clean Gets Nasty
« on: Time Format »

I was playing around with SS clean on my MP-1s, and was reminded of something that’s been happening since the beginning:  SS Clean works OK with OD1 up as high as 5.5, but any higher, and a strong strum will throw it into a fuzzy kind of distortion.  It’s not rhythmic, just on a strong strum, depending on the OD1 setting, will stay for a few seconds or longer, and then fade back out till the next “trigger”.  Any ideas?  Flaky diode?
Logged

rnolan

  • Administrator
  • Superhero Member
  • ******
  • Offline Offline
  • Posts: 5611
Re: Solid State Clean Gets Nasty
« Reply #1 on: Time Format »

May be OD1 trim pot setting?  worth a look.
Logged
Studio Rig: MP2/MB1 > Eurorack UB2442FX-Pro > TC M-One XL > Behringer Truths (with Truth Sub) / QUAD ESL 63s
Live Rig: MP2/MB1 > Alesis Quadverb > Alesis Midiverb 4 > Yamaha AM802 > B200s/Carvin TS100/DCM200L > ADA Split Stacks/Mesa P112s

MarshallJMP

  • Superhero Member
  • ******
  • Offline Offline
  • Posts: 4590
    • marshalljmpmodshop.net
Re: Solid State Clean Gets Nasty
« Reply #2 on: Time Format »

What is the setting of OD2?
Logged

Moff40

  • Newbie
  • *
  • Offline Offline
  • Posts: 35
Re: Solid State Clean Gets Nasty
« Reply #3 on: Time Format »

OD1 trimpot is between 50 and 75%, but it can be backed right off and it still happens.

OD2 on the front panel is quite low, 1.0 or 2.0, although I’ve changed it up and down from there.  Strangely, this only happens on SS settings; tube settings are fine.  That said, as I write this, I realize even my tube voicings don’t use an OD1 setting above 5 (I find there’s plenty of gain available in the 3-4.8 range).  I’ll experiment to see if it also happens on tube settings.
Logged

Moff40

  • Newbie
  • *
  • Offline Offline
  • Posts: 35
Re: Solid State Clean Gets Nasty
« Reply #4 on: Time Format »

OK.  I had a bit of time before work, so dug in a little further.  It DOES happen on Tube Clean, but can’t really tell in tube dist (by the time you get to 5.0, there’s tons of “good” distortion already happening).  It’s OK with OD1 settings under 5.0, but at 5.5, a strong stum will cause a jump in the amount of distortion for a few seconds, then it will drop back to normal if I let the chord ring out.  At higher ID1 settings, the “fuzz” just lasts longer before eventually returning to normal.
Logged

Moff40

  • Newbie
  • *
  • Offline Offline
  • Posts: 35
Re: Solid State Clean Gets Nasty
« Reply #5 on: Time Format »

By the way, this is on the unit that I just de-modded, not the one that was raised from the dead (I have nicknamed that one “Lazarus” :) ).  It had been doing it before that, but since I don’t generally use SS, I didn’t think too much of it.
Logged
Pages: [1]   Go Up