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Temp "Time Format" issue Fix in Discussions

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Author Topic: MDRT vs. Noise Reduction Mod (Or both)  (Read 1796 times)

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jlowe1116

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Hey ADA fans,

I purchased and fell in love with my MB-1 back in about 2008. I hadn't played much over the last 4 years or so but in the last 3 months I have heavily gotten back into playing and would like to do some recording again. The problem is, there is sooooo much noise coming through my amp when using my MB-1.

Now, I am at a point where I would like to spend some money and invest in my MB-1 but I would like a good place to start:

What should I look for when taking the lid off this thing in terms of some caps that would need to be replaced due to old age/usage?

Is the MDRT so highly recommended because it make a big difference in terms of tone (also anyone have any before and after clips)?

Does the MDRT do a good enough job by itself in removing buzz where I wouldn't need the noise reduction mod?

Should I just go ahead and do both?

Thank you all so much for your feedback and keep on rocking!

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rnolan

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Re: MDRT vs. Noise Reduction Mod (Or both)
« Reply #1 on: Time Format »

Hey jlowe1116  :wave: welcome to the depot, I see one of the guys set you up an account  :thumb-up: .I bought 2 MB-1s from the US and sent them via MJMP for an overhaul.  Both have MDRTs now (which solved my power problem being in Australia).  I got him to do whatever he thought was necessary so check with him what's recommended.I've not heard an MB-1 without the MDRT so can't directly compare, Peter can probably comment about that.  I know he's a big fan of the MDRT and also Burr Brown opp amp(s).  Both of mine are quiet as a mouse.  I have one in my studio rack and one in my live MP-2/MB-1 hybrid rack.  Awesome bass preamps, best I've ever heard.The noise reduction mod is worth doing as well as the MDRT as the caps are old.  Also worth changing the tubes, I put some Mullard long plates in mine.
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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

Peter H. Boer

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Nothing beats MB-1s and MP-1s with MDRTs

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jlowe1116

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Re: MDRT vs. Noise Reduction Mod (Or both)
« Reply #3 on: Time Format »

Hey jlowe1116  :wave: welcome to the depot, I see one of the guys set you up an account  :thumb-up: .I bought 2 MB-1s from the US and sent them via MJMP for an overhaul.  Both have MDRTs now (which solved my power problem being in Australia).  I got him to do whatever he thought was necessary so check with him what's recommended.I've not heard an MB-1 without the MDRT so can't directly compare, Peter can probably comment about that.  I know he's a big fan of the MDRT and also Burr Brown opp amp(s).  Both of mine are quiet as a mouse.  I have one in my studio rack and one in my live MP-2/MB-1 hybrid rack.  Awesome bass preamps, best I've ever heard.The noise reduction mod is worth doing as well as the MDRT as the caps are old.  Also worth changing the tubes, I put some Mullard long plates in mine.

Thanks for the information. I remember clicking on this site (or maybe some older forums) and reading up about the MB-1 before I bought it about 10 years ago. I was planning on doing the Bill Brown op-amp upgrade after I did the MDRT and noise mod. Thank you for the insight and I look forward to being active on these forums.
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van Sinn

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Re: MDRT vs. Noise Reduction Mod (Or both)
« Reply #4 on: Time Format »

IMHO, noise aren't a problem in the MB-1 unless the capacitors have dried out, and as such no longer filters correctly. Replace those as stated in the thread Peter referred above.
The Burr-Brown opamp replacement IMHO has more to do with tone than noise, but as tone is always important, might be a good idea doing that replacement while you're ordering components anyways ;)
I didn't install the MDRT, so can't directly talk about what it does, but to my knowledge it will improve tone, dynamics and likely distortion too, so, I would install it.
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..but it's buggy!
- it's software..

jlowe1116

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Re: MDRT vs. Noise Reduction Mod (Or both)
« Reply #5 on: Time Format »

IMHO, noise aren't a problem in the MB-1 unless the capacitors have dried out, and as such no longer filters correctly. Replace those as stated in the thread Peter referred above.
The Burr-Brown opamp replacement IMHO has more to do with tone than noise, but as tone is always important, might be a good idea doing that replacement while you're ordering components anyways ;)
I didn't install the MDRT, so can't directly talk about what it does, but to my knowledge it will improve tone, dynamics and likely distortion too, so, I would install it.

Thanks for the info. Does the cap replacements in the quoted thread vary depending on which EPROM I have?
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MarshallJMP

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Re: MDRT vs. Noise Reduction Mod (Or both)
« Reply #6 on: Time Format »

Not really unless you have a really old MB-1.
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rnolan

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Re: MDRT vs. Noise Reduction Mod (Or both)
« Reply #7 on: Time Format »

The 2.05 EPROM is also worth doing and gives you some continuous control (CC) capabilities, I use the stereo master vol control so I can control the output level with an expression pedal.  There's some posts I did about CC control of MB-1 which are probably worth reading.  You can work it out from the manual and release notes but it takes a bit to get your head around it  :crazy:
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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
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