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Thread: Nelson Pass B1 preamp build

  1. #11
    Join Date: Oct 2016

    Location: Bolton, England

    Posts: 1,242
    I'm Andrew.

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    Hi Oliver

    Yes, what I referred to as a conventional stepped attenuator is, I think, often referred to as a series attenuator. Yes, it presents pretty much a constant load to the source. That would be my choice.

  2. #12
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 5,678
    I'm Oliver.

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    Quote Originally Posted by RothwellAudio View Post
    Hi Oliver

    Yes, what I referred to as a conventional stepped attenuator is, I think, often referred to as a series attenuator. Yes, it presents pretty much a constant load to the source. That would be my choice.
    Ah, excellent! Looks like the advice was sound. As usual!

    I looked at the Shunt type with ZFoil resistors but couldn't justify the spend.
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK5 tonearm > Ortofon Kontrapunkt b > Wizard Jfet MC Valve Phonostage (Telefunken Valves)
    Digital: Firebottle modded Xiang Sheng DAC (Telefunken Valve)
    Amplification: Nelson Pass DCB1 & Firebottle Monoblocks (Telefunken Valves) & Monarchy Audio SM-70 Class A Amplifier
    Cables: Fisual S-Flex Speaker Cable & SPOTFIRE IC Cables & NEW SPOTFIRE Tonearm cable
    Speakers: Pioneer CS-77A

  3. #13
    Join Date: Apr 2008

    Location: Warrington

    Posts: 2,973
    I'm Neil.

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    Just a little clarification that this is not a Pass B1, it is a DC-coupled version of the B1 with on-board shunt regulators, and is thus better than the Pass B1.


    Sent from my iPhone using Tapatalk
    Mana Acoustics Racks / Bright Star IsoNodes Decoupling >> Custom Silent Media Server >> Halide Bridge USB (with AQVOX USB power) >> Pedja Rogic's Audial Model S DAC + Pioneer PL-71 turntable / Vista Audio phono-1 mk II / Denon PCL-5 headshell / Reson Reca >> LFD DLS >> LFD PA2M (SE) >> Royd RR3s.

  4. #14
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 4,217
    I'm Alan.

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    That's why I suggested Oliver snap it up quick

  5. #15
    Join Date: Mar 2014

    Location: KY - Scotland

    Posts: 3,145
    I'm Mike.

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    I tried a DC B1, kept it a week, and that was only because I worked 3 days that week, otherwise it would have been gone sooner lol

    Best of luck with the build, hope it turns out good for you.

    Sent from my SM-G950F using Tapatalk

  6. #16
    Join Date: Oct 2016

    Location: Bolton, England

    Posts: 1,242
    I'm Andrew.

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    I would seriously consider re-housing the circuit in a new, bigger box. Having that large mains transformer sitting right next to everything else would concern me. A bigger box would give you more space to work and allow you to get the mains transformer well off to one side.

  7. #17
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 5,678
    I'm Oliver.

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    Quote Originally Posted by Yomanze View Post
    Just a little clarification that this is not a Pass B1, it is a DC-coupled version of the B1 with on-board shunt regulators, and is thus better than the Pass B1.


    Sent from my iPhone using Tapatalk
    Ah! Yes that good news lol
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK5 tonearm > Ortofon Kontrapunkt b > Wizard Jfet MC Valve Phonostage (Telefunken Valves)
    Digital: Firebottle modded Xiang Sheng DAC (Telefunken Valve)
    Amplification: Nelson Pass DCB1 & Firebottle Monoblocks (Telefunken Valves) & Monarchy Audio SM-70 Class A Amplifier
    Cables: Fisual S-Flex Speaker Cable & SPOTFIRE IC Cables & NEW SPOTFIRE Tonearm cable
    Speakers: Pioneer CS-77A

  8. #18
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 5,678
    I'm Oliver.

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    Quote Originally Posted by mikeyb View Post
    I tried a DC B1, kept it a week, and that was only because I worked 3 days that week, otherwise it would have been gone sooner lol

    Best of luck with the build, hope it turns out good for you.

    Sent from my SM-G950F using Tapatalk
    Mikey lol, that made me laugh.

    What didn't you like about it and what did you use it with?

    Hopefully it's a better experience than yours.
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK5 tonearm > Ortofon Kontrapunkt b > Wizard Jfet MC Valve Phonostage (Telefunken Valves)
    Digital: Firebottle modded Xiang Sheng DAC (Telefunken Valve)
    Amplification: Nelson Pass DCB1 & Firebottle Monoblocks (Telefunken Valves) & Monarchy Audio SM-70 Class A Amplifier
    Cables: Fisual S-Flex Speaker Cable & SPOTFIRE IC Cables & NEW SPOTFIRE Tonearm cable
    Speakers: Pioneer CS-77A

  9. #19
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 5,678
    I'm Oliver.

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    Quote Originally Posted by RothwellAudio View Post
    I would seriously consider re-housing the circuit in a new, bigger box. Having that large mains transformer sitting right next to everything else would concern me. A bigger box would give you more space to work and allow you to get the mains transformer well off to one side.
    I know Andrew but the cost of buying a new case is out of the question at the minute. I may be able to re-home the transformer into a smaller case and we'll away from the circuit. I'll see how big the transformer is when it arrives and work from there.

    After I've had a listen to it, as I don't want to throw good money at a dead duck.
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK5 tonearm > Ortofon Kontrapunkt b > Wizard Jfet MC Valve Phonostage (Telefunken Valves)
    Digital: Firebottle modded Xiang Sheng DAC (Telefunken Valve)
    Amplification: Nelson Pass DCB1 & Firebottle Monoblocks (Telefunken Valves) & Monarchy Audio SM-70 Class A Amplifier
    Cables: Fisual S-Flex Speaker Cable & SPOTFIRE IC Cables & NEW SPOTFIRE Tonearm cable
    Speakers: Pioneer CS-77A

  10. #20
    Join Date: Mar 2014

    Location: KY - Scotland

    Posts: 3,145
    I'm Mike.

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    Quote Originally Posted by Bigman80 View Post
    Mikey lol, that made me laugh.

    What didn't you like about it and what did you use it with?

    Hopefully it's a better experience than yours.
    I'm just very susceptible to an edge on treble and it was the same when I tried the EWA M50 Pre I borrowed from Colin.

    Both into my Primaluna Power amp, but don't worry I'm sure you'll like the Pass. It just didn't suit my ears.




    Sent from my SM-G950F using Tapatalk

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