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Thread: a new kind of preamp

  1. #1
    Super Moderator Hofmannhp's Avatar
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    a new kind of preamp

    Hi forum,

    I want to introduce a new preamp project.
    After collecting some parts oveer several months, now the main parts are together and ready for wirering.
    All parts are from professional studio equipment with best audio quality. Each single module has balanced transformer coupled I/Os (high quality transformers don't reduce the audio quality) and is internal active with +22dB headroom.
    The faders are equiped with P+G 5" conductive plastic resistors.
    The equalizers (mono) are parametric with different bandwidht and center frequency.
    Any questions???

    HP
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  2. #2
    Obviously... not a golfer grumpy's Avatar
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    reminds me of Levinson's Cello "Audio Suite" ...
    in an 'escaped out of the physics lab' sort of way


    Looks like a lot of fun & capability in the same
    box

    -grumpy

  3. #3
    Administrator Mr. Widget's Avatar
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    What brand of board are the parts from?

    Widget

  4. #4
    Super Moderator Hofmannhp's Avatar
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    Preamp

    Originally posted by grumpy
    reminds me of Levinson's Cello "Audio Suite" ...
    in an 'escaped out of the physics lab' sort of way

    Looks like a lot of fun & capability in the same
    box
    -grumpy
    grumpy:....your absolutly right....a lot of fun.
    Some high end audio from the "golden years" often copied this system of equipment.....like Dieter Burmester from Germany and many others (I think you know the high end amps from Burmester)
    The showed system is just the beginning and is very flexible in system configuration. You are able to set insert points whereever you want without reducing quality.

    Widget:
    the showed system is in this stage the first arrangement and very flexible. The single modules are from different brands, what is no problem in cause of the normed I/O specs.
    I'm nearly sure that you never heard of this european (german) brands of professional studio eq. like "Telefunken, BFE, Delta, Neumann (you may know) and others.
    For the acceptance of their products in a hardly competitive market they all had to sell first class, with pin compatible modules.

    BTW: I am a collector of the manuals of this stuff since 20 years. If anyone needs assistance....

    HP
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  5. #5
    Senior Member dancing-dave's Avatar
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    wowie zowie

    I'm impressed. Telefunken, Neumann, Klangfilm, etc......all very great. Also in the US Fairchild has done some nice equipment too which is always good to find.

    Have you implemented a phono preamp in your unit? That is assuming you're into vinyl.

  6. #6
    Super Moderator Hofmannhp's Avatar
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    Re: wowie zowie

    Originally posted by dancing-dave
    .....Have you implemented a phono preamp in your unit? That is assuming you're into vinyl.
    Hi Dave,
    at this time I don't have a phono unit. But I'm workin on it.
    I just develop a high q mic amp with very little noise transistors as the first stage (LM 394 or MAT 02). Based on this I easy can add the equalizing for a MM and MC phono amp stage, of cause built in the same kind of mini cases and with balanced transformer outputs.

    HP
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  7. #7
    Senior Member Figge's Avatar
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    it looks real cool! could u build one for me too?

    i would like to see my girlfriend put on a cd with that thing
    Fredrik G.

  8. #8
    Super Moderator Hofmannhp's Avatar
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    girlfriend

    Originally posted by Figge
    it looks real cool! could u build one for me too?
    i would like to see my girlfriend put on a cd with that thing
    Hi Figge,

    no problem.....if you can get the parts, I can tell you how to build one

    BTW: the use of this preamp is more easy then a conventional.
    Only relais controlling keys...push the CD-key and lift the fader....thats it

    here's a topview from the backside cardrack with amps and power supply.

    HP
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  9. #9
    Senior Member Figge's Avatar
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    it has a really cool heavyduty look!

    gonna start lookin´ for the parts
    Fredrik G.

  10. #10
    Super Moderator Hofmannhp's Avatar
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    Preamp

    Originally posted by Figge
    it has a really cool heavyduty look!

    gonna start lookin´ for the parts
    Hi Figge,

    please let me know what parts you found.
    Are you familiar with electronics?

    HP
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  11. #11
    Senior Member Figge's Avatar
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    yes a little. i am schooled to be radio/tv repairsman. but work at a factory as welder. strange how it turns out hu? i do some amateur repairs at home, mostly on stereos.
    Fredrik G.

  12. #12
    Super Moderator Hofmannhp's Avatar
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    Preamp

    Originally posted by Figge
    yes a little. i am schooled to be radio/tv repairsman. .......
    Hi again Figge,

    thats ok,.......let me know if you need some documents of old studio stuff ( Neumann, Lawo, BFE, Tonographie, ANT, Delta, etc.)

    HP
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  13. #13
    Super Moderator Hofmannhp's Avatar
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    my first pro preamp

    Hi all,

    thread refresh......after 2 1/2 years, this preamp is short before finish. Just workin on the cab......

    HP
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  14. #14
    Senior Member paragon's Avatar
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    Pre

    Hallo HP,

    Superteil, Du hast ja auch das Glück (aufgrund deines Jobs) an solche Teile zu kommen.

    Gruß, Eckhard

  15. #15
    Senior Member rs237's Avatar
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    Quote Originally Posted by paragon View Post
    Hallo HP,

    Superteil, Du hast ja auch das Glück (aufgrund deines Jobs) an solche Teile zu kommen.

    Gruß, Eckhard

    Yes, but he is so nice and reserves not everything for themselves. Thanks HP,
    i love the old studio equipment.

    regards

    juergen

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