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Thread: Nelson Pass B1 preamp build

  1. #41
    Bigman80 Guest

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    Ah I see.
    Quote Originally Posted by 337alant View Post
    No replaced a PFM B4

    Alan

  2. #42
    Bigman80 Guest

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    Been shopping in the Chinese market and bought one of these.......

    http://s.aliexpress.com/ERF7JveM?fromSns=Copy to Clipboard

    Unfortunately, the casework i originally got with the board and traffo just isn't big enough.

    Extender bars will be used to get the Khozmo attenuator and the Elma switch as close to the RCA sockets as possible, keeping the signal path nice and short.

  3. #43
    Join Date: Aug 2012

    Location: Hartlepool UK

    Posts: 1,640
    I'm Alan.

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    Quote Originally Posted by Bigman80 View Post
    Been shopping in the Chinese market and bought one of these.......

    http://s.aliexpress.com/ERF7JveM?fromSns=Copy to Clipboard

    Extender bars will be used to get the Khozmo attenuator and the Elma switch as close to the RCA sockets as possible, keeping the signal path nice and short.
    Yes good plan thats how I do it as well
    Its also a big saving in the amount of hook up wire you use going from the front panel to the back

    IMG_0088 by Alan Towell, on Flickr

    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

  4. #44
    Bigman80 Guest

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    Quote Originally Posted by 337alant View Post
    Yes good plan thats how I do it as well
    Its also a big saving in the amount of hook up wire you use going from the front panel to the back

    IMG_0088 by Alan Towell, on Flickr

    Alan
    Well, if I'm doing things the same you, I must be on the right path.

  5. #45
    Bigman80 Guest

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    All the parts are here!!!!

    Time to start the assembly

    In a mock layout, I have settled on this (picture)

    Any suggestions?

  6. #46
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 6,089
    I'm Alan.

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    Looks good, keeping all interconnects short

  7. #47
    Bigman80 Guest

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    Quote Originally Posted by Firebottle View Post
    Looks good, keeping all interconnects short
    Sweet,

    How do I wire it all up between the board/attenuator/selector switch?

  8. #48
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 6,089
    I'm Alan.

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    Can't really tell you from that photograph.

  9. #49
    Bigman80 Guest

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    Any better?

  10. #50
    Join Date: Aug 2012

    Location: Hartlepool UK

    Posts: 1,640
    I'm Alan.

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    From the back panel each input pair (L & R channel) go directly to the switch, lets say input 1 left channel to the first outer tag pin after the mounting bolt and right channel to the opposite tag, input 2 to the next pair of opposite tags and work you way round with all you inputs.
    The R & L switch outputs are the 2 inner tags, run wires from these to the R&L Inputs of the stepped attenuator .
    Join all of your input grounds together for each channel with a tinned wire, run a wire to your start earth point and back to the Stepped attenuator grounds

    The L&R outputs from the attenuator go to the Pre amp input L&R

    I use a start earth point at the output Grd of the power supply caps so you would need 2 grounds from there to the ground on the amp board input

    The output from the amp board go to you RCA outs on the back pannel

    Note make sure that bolt on the transformer does not touch the top pannel or ou will get a short on your transformer

    Hope this helps

    IMG_0089 by Alan Towell, on Flickr
    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

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