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Thread: Nelson Pass B1 preamp build

  1. #141
    Join Date: Jun 2018

    Location: Mildenhall, Suffolk

    Posts: 297
    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
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 9,770
    I'm Oliver.

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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.
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK6 tonearm > Ortofon Kontrapunkt b > Bigbottle Jfet MC Valve Phonostage
    Digital: Orchard Audio PecanPi with JRiver
    Preamplifier: DCB1 with Khozmo 48 Step Series Attenuator or Neurochrome Differential Preamp
    Amplification: Neurochrome Modulus 686
    Cables: SPOTFIRE Speaker Cable & SPOTFIRE IC Cables & SPOTFIRE Tonearm cable
    Speakers: Mordaunt Short Performance 880

    Price List For SPOTFIRE Cables here:https://bit.ly/2Uxiv3j

    Alternative reading: http://www.audioaddictsforum.com

  3. #143
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 9,770
    I'm Oliver.

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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?
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK6 tonearm > Ortofon Kontrapunkt b > Bigbottle Jfet MC Valve Phonostage
    Digital: Orchard Audio PecanPi with JRiver
    Preamplifier: DCB1 with Khozmo 48 Step Series Attenuator or Neurochrome Differential Preamp
    Amplification: Neurochrome Modulus 686
    Cables: SPOTFIRE Speaker Cable & SPOTFIRE IC Cables & SPOTFIRE Tonearm cable
    Speakers: Mordaunt Short Performance 880

    Price List For SPOTFIRE Cables here:https://bit.ly/2Uxiv3j

    Alternative reading: http://www.audioaddictsforum.com

  4. #144
    Join Date: Jun 2018

    Location: Mildenhall, Suffolk

    Posts: 297
    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: 464
    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.

    TT: 1986 Townshend Rock, 1980 Luxman PD264, 1978 Planar 3 in original condition. LP12 (work in progress).
    Arm: AO modified Moth RB250, Hadcock GH228, Rega R200. Acost Lustre GST1, Hadcock GH228 special.
    Cart: AT OC9 III, Shure V15 III, Bellex HOMC, Garrott K2, VdH DDT-II special.
    Phono: Vincent PHO-8, Akitika MM.
    CDPs: California Labs CL15, Pioneer DVP 676A, Vincent CD-S4.
    Digi: Squeezeboxes. Yamaha WXC50. Denafrips Ares II.
    Amps: Copland CSA-29, Denon PMA250 II, a couple of cheap T amps, WHAMMY headphone Amp. First Watt DIY M2X, B1 Mesmerize Pre. Elekit TU-8500 Pre, Pass B1Korg DIY pre.
    Speakers: 1995 Castle Howard S1, 1970 Wharfedales, Dick Smith's $80 specials. KEf Ref 104aB, Usher S-520.
    Headphones: AKG Q701, Massdrop / Hifiman HE-4XX.

  6. #146
    Join Date: Sep 2013

    Location: North Island New Zealand

    Posts: 1,403
    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: 124
    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.
    Jay's Audio CDT2 MK2 + Magna Mano Ultra, Phison PD2SE + DIY Pass Aleph 60 monoblocks, DIY CAOW1 standmount speakers

  8. #148
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 9,770
    I'm Oliver.

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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
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK6 tonearm > Ortofon Kontrapunkt b > Bigbottle Jfet MC Valve Phonostage
    Digital: Orchard Audio PecanPi with JRiver
    Preamplifier: DCB1 with Khozmo 48 Step Series Attenuator or Neurochrome Differential Preamp
    Amplification: Neurochrome Modulus 686
    Cables: SPOTFIRE Speaker Cable & SPOTFIRE IC Cables & SPOTFIRE Tonearm cable
    Speakers: Mordaunt Short Performance 880

    Price List For SPOTFIRE Cables here:https://bit.ly/2Uxiv3j

    Alternative reading: http://www.audioaddictsforum.com

  9. #149
    Join Date: Aug 2009

    Location: Staffordshire, England

    Posts: 26,359
    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:

    *Sony SCD XB790QS* Nelson Pass DCB1 / Krell KSA100 mkII * JM Lab Electra 926 *


    'You fool! To think that your ape-brain could contain the full knowledge of the Krell!'

  10. #150
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 9,770
    I'm Oliver.

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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%
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK6 tonearm > Ortofon Kontrapunkt b > Bigbottle Jfet MC Valve Phonostage
    Digital: Orchard Audio PecanPi with JRiver
    Preamplifier: DCB1 with Khozmo 48 Step Series Attenuator or Neurochrome Differential Preamp
    Amplification: Neurochrome Modulus 686
    Cables: SPOTFIRE Speaker Cable & SPOTFIRE IC Cables & SPOTFIRE Tonearm cable
    Speakers: Mordaunt Short Performance 880

    Price List For SPOTFIRE Cables here:https://bit.ly/2Uxiv3j

    Alternative reading: http://www.audioaddictsforum.com

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