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Thread: DC B1 pre-amp with phono stage

  1. #1
    Join Date: Jan 2014

    Location: Northants

    Posts: 244
    I'm Martin.

    Default DC B1 pre-amp with phono stage

    Just finished this pre-amp. Hypnotize DC B1 Jfet buffer with a MM phono stage using the Elliot Sound Products PCB and Burr Brown OPA2134 jfet audio opamps.

    Individual transformers for phono stage and buffer.
    Shunt regulated dual power supply for the phono stage.
    50K stepped attenuator.
    Elma source selector switch.
    Adjustable brightness power indicator led.
    Aluminium case, 3mm thick top and bottom panels.







  2. #2
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 10,156
    I'm Oliver.

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    Quote Originally Posted by disarmamant View Post
    Just finished this pre-amp. Hypnotize DC B1 Jfet buffer with a MM phono stage using the Elliot Sound Products PCB and Burr Brown OPA2134 jfet audio opamps.

    Individual transformers for phono stage and buffer.
    Shunt regulated dual power supply for the phono stage.
    50K stepped attenuator.
    Elma source selector switch.
    Adjustable brightness power indicator led.
    Aluminium case, 3mm thick top and bottom panels.






    Doesn't that look tidy!!

    Lovely work.

  3. #3
    Join Date: Jul 2017

    Location: Kent

    Posts: 478
    I'm Paul.

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    Top class build there. Is that one of them valab stepped attenuators?

    Sent from my CLT-L09 using Tapatalk
    Current system:
    RPi + Allo Digione
    Beresford Caiman Seg & Dorado powered by 15v Linear PSU
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    110aH Leisure Battery powers the Mini-1 & Digione

  4. #4
    Join Date: Jan 2014

    Location: Northants

    Posts: 244
    I'm Martin.

    Default

    Quote Originally Posted by Pepperamip View Post
    Top class build there. Is that one of them valab stepped attenuators?
    Thanks. Yes it's one of the Valab jobbies.

  5. #5
    Join Date: Jan 2014

    Location: london se6

    Posts: 870
    I'm AndyElectroNumpty.

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    Very nice build , how's it sound?
    At the cutting edge of Numptyness!

  6. #6
    Join Date: Jan 2014

    Location: Northants

    Posts: 244
    I'm Martin.

    Default

    Quote Originally Posted by smangus View Post
    Very nice build , how's it sound?
    Thank you. It sounds really good.

    The phono stage is particularly good, very low noise. I have used Rod Elliotís phono design before and it deserves the positive reports it gets.


    Sent from my iPad using Tapatalk

  7. #7
    Join Date: Aug 2014

    Location: Aarhus, Denmark

    Posts: 298
    I'm Peter.

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    Great-looking unit! I have one of your earlier builds of the B1 - I believe with the same phono board. Too bad that I haven't been able to make my Benz Micro Gullwing SLR sing with my Partridge 977 SUT - also one of yours, by the way. All the mm-stages that I have used with that combo has sounded off and strangely bland (EAR 802/Croft Riia R/Pass B1). Did you ever build a Pass B4 buffer, by the way?
    I'm Peter, Denmark: AD Audio Satchmo (coming) / Michell Argo HR + EAR 516 + Quad ESL 57 + PTP6 Acoustand L75 + Alfred Bokrand Ortofon 10" - Denon 103D + Emerald Phono Stage + Allnic AUT 2000 SUT + Leak Stereofetic FM Tuner + B&O Beocord 6500 Cassette Deck + Synology DS 415+("upgraded" to 8gb memory) cabled to Win10 PC - JRiver - Paul Pang USB-splitter cable - Linear 5v psu - Nuforce U192s - Line Magnetic 502CA DAC

  8. #8
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 10,156
    I'm Oliver.

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    Quote Originally Posted by Rosewind View Post
    Great-looking unit! I have one of your earlier builds of the B1 - I believe with the same phono board. Too bad that I haven't been able to make my Benz Micro Gullwing SLR sing with my Partridge 977 SUT - also one of yours, by the way. All the mm-stages that I have used with that combo has sounded off and strangely bland (EAR 802/Croft Riia R/Pass B1). Did you ever build a Pass B4 buffer, by the way?
    You need a good Valve phonostage.

  9. #9
    Join Date: Aug 2014

    Location: Aarhus, Denmark

    Posts: 298
    I'm Peter.

    Default

    Ha! Been there, done that. Not with the EAR 516 and Quad ESL 57s, though.
    EDIT: I wouldn't mind a listen to a line stage version of the Pass B1 "hypnotize", or a Pass B4 buffer, which should be excellent.
    I'm Peter, Denmark: AD Audio Satchmo (coming) / Michell Argo HR + EAR 516 + Quad ESL 57 + PTP6 Acoustand L75 + Alfred Bokrand Ortofon 10" - Denon 103D + Emerald Phono Stage + Allnic AUT 2000 SUT + Leak Stereofetic FM Tuner + B&O Beocord 6500 Cassette Deck + Synology DS 415+("upgraded" to 8gb memory) cabled to Win10 PC - JRiver - Paul Pang USB-splitter cable - Linear 5v psu - Nuforce U192s - Line Magnetic 502CA DAC

  10. #10
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 10,156
    I'm Oliver.

    Default

    Quote Originally Posted by Rosewind View Post
    Ha! Been there, done that. Not with the EAR 516 and Quad ESL 57s, though.
    EDIT: I wouldn't mind a listen to a line stage version of the Pass B1 "hypnotize", or a Pass B4 buffer, which should be excellent.
    Can't beat a well built DCB1 IMO.

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