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Thread: Nelson Pass B1 preamp build

  1. #21
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 5,678
    I'm Oliver.

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    Ah, I see. Ok, well I'm not put off by that so that's good. Just looking forward to it arriving and getting started.
    Quote Originally Posted by mikeyb View Post
    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
    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

  2. #22
    Join Date: Aug 2012

    Location: Hartlepool UK

    Posts: 1,364
    I'm Alan.

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    Oliver
    Why would you only choose a 2 way switch ?, get a 6 way and give yourself the option of more inputs if required

    Alan
    Turntable - Garrard 401/Jelco 750L/Ortofon Kontrapunkt B, Pioneer PLC 590, SME 3009/2 , Denon DL103R - DIY Paradise Phono stage - Reel 2 Reel Studer A810, Otari MX55,Tascam BR20 - Digital HTPC / Young Dac - Preamp - DIY B4, 821, Power Amp's DIY Voyager Mono Block, Speakers Tannoy precision 6.4 / Wilmslow Kit Volt BM220.8 / Scanspeak D2905/9500

  3. #23
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 4,217
    I'm Alan.

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    2 pole 6 way Alan.

  4. #24
    Join Date: Aug 2012

    Location: Hartlepool UK

    Posts: 1,364
    I'm Alan.

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    Ah I see, sorry miss read the thread
    excellent switches the Elma, I use them myself
    Alan
    Turntable - Garrard 401/Jelco 750L/Ortofon Kontrapunkt B, Pioneer PLC 590, SME 3009/2 , Denon DL103R - DIY Paradise Phono stage - Reel 2 Reel Studer A810, Otari MX55,Tascam BR20 - Digital HTPC / Young Dac - Preamp - DIY B4, 821, Power Amp's DIY Voyager Mono Block, Speakers Tannoy precision 6.4 / Wilmslow Kit Volt BM220.8 / Scanspeak D2905/9500

  5. #25
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 5,678
    I'm Oliver.

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    Quote Originally Posted by 337alant View Post
    Ah I see, sorry miss read the thread
    excellent switches the Elma, I use them myself
    Alan
    No worries!

    I had one in the Slagle and it was quality so why go anywhere else!
    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

  6. #26
    Join Date: Apr 2012

    Location: London

    Posts: 352
    I'm james.

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    If I'd kept it I'd have been keen to try upping the bias, but for that you'd want a bigger trafo and heatsinking. I'm pretty sure you have also got a bunch of audio note silver phono sockets on there as well, it's a nicely made bit of kit. And it never hummed at all so the trafo must be well enough shielded.
    Wish I could remember which chap sold it to me. Anyone recognise it?

    Sent from my BLA-L09 using Tapatalk

  7. #27
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 5,678
    I'm Oliver.

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    Quote Originally Posted by Jazid View Post
    If I'd kept it I'd have been keen to try upping the bias, but for that you'd want a bigger trafo and heatsinking. I'm pretty sure you have also got a bunch of audio note silver phono sockets on there as well, it's a nicely made bit of kit. And it never hummed at all so the trafo must be well enough shielded.
    Wish I could remember which chap sold it to me. Anyone recognise it?

    Sent from my BLA-L09 using Tapatalk
    Gave it the once over today and there's a quite a lot of "build up" on the sockets and which looks like it's in the sheath of the wires too.There's also some on the RCA sockets. Nothing a good clean won't fix.

    I decided to replace them and get some of the best quality copper wire known to man!!!

    Upping the bias may be possible BUT as it will require a new TF I leave that for now.

    I may end up having to remove the TF to fit everything in so if I do I will go bigger on the TF too.
    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. #28
    Join Date: Oct 2016

    Location: Bolton, England

    Posts: 1,242
    I'm Andrew.

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    Quote Originally Posted by Jazid View Post
    If I'd kept it I'd have been keen to try upping the bias, but for that you'd want a bigger trafo and heatsinking.
    Here's a quote from Nelson Pass himself, taken from his page about the B1:
    "The preamp typically draws fewer that 0.02 amps, so current is not much of an issue."
    That transformer will deliver 20mA easily. There's no need for anything bigger.

  9. #29
    Join Date: Apr 2008

    Location: Warrington

    Posts: 2,973
    I'm Neil.

    Default Nelson Pass B1 preamp build

    Quote Originally Posted by RothwellAudio View Post
    Here's a quote from Nelson Pass himself, taken from his page about the B1:
    "The preamp typically draws fewer that 0.02 amps, so current is not much of an issue."
    That transformer will deliver 20mA easily. There's no need for anything bigger.
    This unit (DCB1) uses shunt regulators, so has much higher current draw. Some people set the bias really high, over an amp, and big heatsinks.
    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.

  10. #30
    Join Date: Oct 2016

    Location: Bolton, England

    Posts: 1,242
    I'm Andrew.

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    Quote Originally Posted by Yomanze View Post
    This unit (DCB1) uses shunt regulators, so has much higher current draw. Some people set the bias really high, over an amp, and big heatsinks.
    Shunt regulators? Does that mean they're like zeners?
    Personally, I wouldn't design something that had the regulators drawing more current than the amplifier does.

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