Let's Get Technical > Schematics & Modifications (mods)

MB-1 Mods?

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peoriashows:
So, here's what I deciphered from my scribbled down notes for the MB-1 noise mod. MarshallJMP (or anyone) will you confirm this is what it consists of?

Replace C56 with Nichicon P/N: UVZ2W220MHD (22uF, 450V, Radial)
Replace C447 with Nichicon P/N: UVZ2W220MHD (22uF, 450V, Radial)
Replace C446 with Nichicon P/N: UVZ2W220MHD (22uF, 450V, Radial)

Replace C25 with Xicon P/N: 140-LLRL25V2200-RC (2200uF, 25V, Radial)
Replace C26 with Xicon P/N: 140-LLRL25V2200-RC (2200uF, 25V, Radial)

Replace C301 with Xicon P/N: 140-LLRL16V3300-RC (3300uF, 16V, Radial)

Replace U12 with BB OPA2604AP OpAmp

Is this correct? was there more to it, are these the right parts and designators? I remember scribbling my really vague notes from a discussion on the old board.

MarshallJMP:
See attached pics. I use Panasonic caps. Also if you have an MDRT you can replace the 4700µF with a 10.000µF.

peoriashows:
thanks. Those values vary quite a bit from what I had above.

bcklndt:
Really interested in those mods ..
Noise mod
Transformer mod
Opamp to Burrbrown mod

Want my MB-1 taken to another level .. or stratosphere ..

rnolan:
Hey bcklndt, I have 2 MB1s that MJMP has done for me.  They both have MDRT and whatever else he did.  I've not heard a stock MB1 to compare but both of mine are amazing.  Really (really) quiet and just sound fantastic  :whoohoo!: :thumb-up: .@MJMP, do you remember all the things you did to them ?  Anyway, whatever it was, they are both the best bass preamps I've ever heard.

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