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Thread: Nelson Pass B1 preamp build

  1. #141
    Join Date: Jun 2018

    Location: Mildenhall, Suffolk

    Posts: 380
    I'm John.

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    Hi Alan
    The circuit board text states.
    Simplistic Pass B1 Buffer, RPRE V2.2, August 2015, Design by Rudi Ratlos.
    It is going away for assembly today.
    Am I correct to assume, it will not be comparable to the recent designs being created, if the circuit is looking different.

  2. #142
    Bigman80 Guest

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    Hi John,

    This is the PCB I associate with the Korg B1 https://diyaudiostore.com/products/b...-pcb-and-jfets

    I don't think it works in the same way as the DCB1 IIRC. I'd have to do some digging.

  3. #143
    Bigman80 Guest

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    Quote Originally Posted by JohnG View Post
    Hi Alan
    The circuit board text states.
    Simplistic Pass B1 Buffer, RPRE V2.2, August 2015, Design by Rudi Ratlos.
    It is going away for assembly today.
    Am I correct to assume, it will not be comparable to the recent designs being created, if the circuit is looking different.
    Where did you get it, John. I cant even find a thread online for it?

  4. #144
    Join Date: Jun 2018

    Location: Mildenhall, Suffolk

    Posts: 380
    I'm John.

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    It came of DIY audio, the seller is still on page two of the sales page, with a few Hypex devices.
    Have a look at post history and it is a as placed in May.
    The builder is the guy on the circuit board, who has a history of activity on the B1 thread on DIY audio.
    It was purchased at under the ad price, as it was a impatient punt from my end, with 2019 being dedicated to investigations of pre amps, that is limping along.

  5. #145
    Join Date: Jun 2010

    Location: Adelaide, South Australia

    Posts: 520
    I'm Steve.

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    B1 layout.jpg

    My B1 in build stage, it is the "Ten Years After" Mezmerise verion from DIYAudio.
    Steve.

    Kit I have:
    CD player, TTs, Phono stages, Pre amps, Power amps, Integrated amps, DACs, Streamers, Speakers and a bunch of cables.

  6. #146
    Join Date: Sep 2013

    Location: North Island New Zealand

    Posts: 1,757
    I'm Chris.

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    It would help IMO to see schematics, to make the thread tangible as to what one version is vs another.

  7. #147
    Join Date: Oct 2015

    Location: Nr Coventry

    Posts: 142
    I'm Ian.

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    Quote Originally Posted by Batty View Post
    B1 layout.jpg

    My B1 in build stage, it is the "Ten Years After" Mezmerise verion from DIYAudio.
    I have a DCB1 built by a friend (http://teribil-audio.com/2018/06/dcb1-preamplifier/) with the same board. If you want to get better sound from it, upgrade the 8 resistors around the output to Audio Note Tantalum. I also upgraded the 2 big caps to Mundorf ones and the 5 smaller caps to Audio Note. In basic form, the DCB1 is really good but when upgraded, it is very, very good. The sound quality to cost ratio is astonishing.

  8. #148
    Bigman80 Guest

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    Quote Originally Posted by ijrussell View Post
    I have a DCB1 built by a friend (http://teribil-audio.com/2018/06/dcb1-preamplifier/) with the same board. If you want to get better sound from it, upgrade the 8 resistors around the output to Audio Note Tantalum. I also upgraded the 2 big caps to Mundorf ones and the 5 smaller caps to Audio Note. In basic form, the DCB1 is really good but when upgraded, it is very, very good. The sound quality to cost ratio is astonishing.
    Couldn't agree more with the AN Tantalum. Awesome capacitors.

    Just give the legs a rub with wire wool before installing and a little clean as the ones I got were really grubby.

    I've made that standard procedure now lol

  9. #149
    Join Date: Aug 2009

    Location: Staffordshire, England

    Posts: 37,778
    I'm Martin.

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    Quote Originally Posted by ijrussell View Post
    The sound quality to cost ratio is astonishing.
    Forget the quality to cost ratio they are just very good regardless.

    Still surprises me every time I use it and mine doesn't have any fancy upgrades.
    Current Lash Up:

    TEAC VRDS 701T > Sony TAE1000ESD > Krell KSA50S > JM Labs Focal Electra 926.

  10. #150
    Bigman80 Guest

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    Quote Originally Posted by Macca View Post
    Forget the quality to cost ratio they are just very good regardless.

    Still surprises me every time I use it and mine doesn't have any fancy upgrades.
    We need to give yours the treatment Martin.

    New psu caps, tantalums, bigger power. The whole nine. Unfortunately, you could do with a better chassis to dissipate the heat.

    You'd love it mate. 100%

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