+ Reply to Thread
Page 4 of 18 FirstFirst ... 2345614 ... LastLast
Results 31 to 40 of 177

Thread: Nelson Pass B1 preamp build

  1. #31
    Bigman80 Guest

    Default

    Quote Originally Posted by 337alant View Post
    The PFM B4 is a good bootstrap buffer stage as well no gain though
    I replaced mine with 2 x Avondale Audio 821A boards (4x gain) and am very happy with it

    Alan
    Replaced a DCB1?

  2. #32
    Join Date: Apr 2012

    Location: London

    Posts: 685
    I'm James.

    Default

    Quote Originally Posted by RothwellAudio View Post
    Having thought about it again I see that shunt regulation in this case isn't a terrible idea. If the preamp was to drive a 10k load with 1V, it would need to supply 0.1mA. Lets go mad and allow it to supply ten times more, so 1mA. The quiescent current requirement is only 20mA anyway, so a shunt regulator that draws, say, 5mA would do fine. That isn't terribly wasteful, won't require a massive transformer and won't dissipate excessive unused power, so is feasible.
    Still, I would probably prefer a series regulator.
    Just to be clear I wasn't saying anyone should do this, just that I would have if I'd kept it. There's a thread of about a godzillion pages long on DIYAudio about this, and the general take is that the higher the bias the better the DCB1 sounds, this thread including input from' papa' himself.

    I don't have a justification for being curious but I do know that what works best in audio on paper doesn't always work best in real life in lugholes. Consequently I would have had a play, not because of a clear technical justification but simply because others found an improvement, I wished to see for myself, and could afford the cost of parts for my own pleasure.

    Sent from my BLA-L09 using Tapatalk

  3. #33
    Bigman80 Guest

    Default

    I'll read the thread lol

  4. #34
    Join Date: Apr 2012

    Location: London

    Posts: 685
    I'm James.

    Default

    Good man, you won't suffer insomnia for a couple of days

    Sent from my BLA-L09 using Tapatalk

  5. #35
    Bigman80 Guest

    Default

    Quote Originally Posted by Jazid View Post
    Good man, you won't suffer insomnia for a couple of days

    Sent from my BLA-L09 using Tapatalk

  6. #36
    Join Date: Apr 2008

    Location: Warrington

    Posts: 3,451
    I'm Neil.

    Default Nelson Pass B1 preamp build

    Quote Originally Posted by Bigman80 View Post
    I'll read the thread lol
    Good luck! 60ma is the default, pushing to 200ma seemed to be a stage up. There is a great build guide somewhere will dig it out.
    Mana Acoustics Racks / Bright Star IsoNodes Decoupling >> Allo DigiOne Player >> 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.

  7. #37
    Bigman80 Guest

    Default

    Quote Originally Posted by Yomanze View Post
    Good luck! 60ma is the default, pushing to 200ma seemed to be a stage up. There is a great build guide somewhere will dig it out.
    Tried last night but there's just way too much to get through.

  8. #38
    Join Date: Apr 2008

    Location: Warrington

    Posts: 3,451
    I'm Neil.

    Default

    Quote Originally Posted by Bigman80 View Post
    Tried last night but there's just way too much to get through.
    Start with this build guide: https://www.audiocircle.com/index.php?topic=85001.0
    Mana Acoustics Racks / Bright Star IsoNodes Decoupling >> Allo DigiOne Player >> 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.

  9. #39
    Bigman80 Guest

    Default

    Cheers. I'll have a look through.
    Quote Originally Posted by Yomanze View Post

  10. #40
    Join Date: Aug 2012

    Location: Hartlepool UK

    Posts: 1,640
    I'm Alan.

    Default

    Quote Originally Posted by Bigman80 View Post
    Replaced a DCB1?
    No replaced a PFM B4

    Alan
    Turntable - Garrard 401/Jelco 750L/Ortofon Kontrapunkt B, Pioneer PLC 590, Micro Sieki MA505 , Denon DL103R - DIY Paradise Phono stage - Reel 2 Reel Studer A810, Otari MX55,Tascam BR20, Revox A77, B77, PR99, TEAC X1000 & 3440, Digital HTPC / Young Dac - Preamp - DIY B4, 821, Power Amp's DIY Avondale NCC300 Mono Block, Speakers Wilmslow Kit Volt BM220.8 / Scanspeak D2905/9500

+ Reply to Thread
Page 4 of 18 FirstFirst ... 2345614 ... LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •