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Thread: Passive Preamps

  1. 25-03-2019, 21:54 #11
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    Bake off s are always needed.
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  2. 25-03-2019, 22:03 #12
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    Quote Originally Posted by Firebottle View Post
    Nelson pass DCB1 is amazingly transparent, depending on the volume control element.
    Just to provide more information this is a potentiometer or stepped attenuator followed by the DCB1 buffer stage.

    Other buffer stages can be used, there are valve based buffer stages available as well, from other vendors.

    A stepped attenuator of sufficient quality will give the best performance, a lot use the Khozmo series attenuator, an alternative that is a little less expensive but of equal transparency is the Acoustic Dimension stepped attenuator.

    Both Khozmo and Acoustic Dimension are available with remote control, though the AD unit is a fair bit cheaper.
    Where are the Acoustic dimension passives sold?
    Current system 1210 GR. CDP - Meridian G08. Amp -Sugden A21I - Sig. Wharfedale Lintons.
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  3. 25-03-2019, 22:30 #13
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    Quote Originally Posted by Light Dependant Resistor View Post
    Is a bake-off needed ?
    We did one.

    The DCB1 is the best preamp Ive heard.

    We used the big one in the pic.

    The write up of the bakeoff was put here:

    http://audioaddictsforum.com/thread/...listening-test
    Last edited by Bigman80; 25-03-2019 at 22:44.
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  4. 25-03-2019, 23:13 #14
    Light Dependant Resistor
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    That's a bit opposite to other forums, https://www.stereo.net.au/forums/top...ttenuator-kit/
    but thanks. From my own experience powering with the recommended 12vAC as in the above review rather than DC 12v is the way to go.
    The technical reasons are that only one half of the mosfet rectifier is used with DC. Maybe await Marco's review, as his is 12v AC
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  5. 25-03-2019, 23:25 #15
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    Quote Originally Posted by Light Dependant Resistor View Post
    That's a bit opposite to other forums, https://www.stereo.net.au/forums/top...ttenuator-kit/
    but thanks. From my own experience powering with the recommended 12vAC as in the above review rather than DC 12v is the way to go.
    The technical reasons are that only one half of the mosfet rectifier is used with DC. Maybe await Marco's review, as his is 12v AC
    Barry
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  6. 25-03-2019, 23:29 #16
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    I think Martin has one tucked away too that has yet to see the light of day.
    It is impossible for anything digital to sound analogue, because it isn't analogue!
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  7. 25-03-2019, 23:33 #17
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    I'm quite tempted to try one of the relay passive pre-amps that have been cropping up on Chinese ebay sites, but I don't want remote control which most seem to include. Strangely, the few that are manual only are dearer.

    I thing Alan (Firebottle) has been trying one.
    It is impossible for anything digital to sound analogue, because it isn't analogue!
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  8. 25-03-2019, 23:43 #18
    Light Dependant Resistor
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    Quote Originally Posted by walpurgis View Post
    I think Martin has one tucked away too that has yet to see the light of day.
    Its a very early edition, which needs updating to latest spec,which I am happy to do.


    ie LDRs were NSL32SR2S vs NSL32SR3 and over 7 years of development following.
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  9. 26-03-2019, 06:54 #19
    Light Dependant Resistor
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    Quote Originally Posted by Barry View Post
    Like all good things, it will happen, I am updating Marco's main board and posting it tomorrow from NZ.... so about 2 weeks from now ...
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  10. 26-03-2019, 07:19 #20
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    Quote Originally Posted by Mikeandvan View Post
    Where are the Acoustic dimension passives sold?
    http://www.acoustic-dimension.com/at...ators-main.htm
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