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6SL7 tube rack preamp

Discussion in 'For Sale: Amps, Preamps, and Cabinets' started by J.Wolf, Oct 3, 2013.


  1. J.Wolf

    J.Wolf Supporting Member

    Joined:
    Apr 29, 2003
    Location:
    Durham, NC
    Disclosures:
    Staff Writer - Bass Musician Magazine
    This is a very cool custom made, hand built tube bass preamp that made for me by a friend of who's in the vintage amp rebuilding/restoration business. It is designed to be (in his words) a sort of "hi-fi B15 front end". Very simple controls: Vol, baxandall style wide 'Q' bass & treble controls. 1/4 in and 1/4 out. 2 rackspace. Dig the punk rock spray paint job... ;-)

    It sounds amazing: very warm, fat and chewy, has a 3 dimensional sound, and has just the right amount of pleasing but subtle hair to it when pushed. The eq controls are wide bandwidth with powerful control. all the components are top notch. It has a TON of clean gain. I have been using it as a front end into a variety of SS bass heads and it sounds awesome, but I just don't use it these days and could use the cash.

    Please see the pics below and the basic schematic sheet that the builder provided. Questions are welcome, I'll do my best to answer. I'll include the 6SL7, 6H9C, and 6SN7 (Jan 6SN7WGTA) that came with it.

    $600 shipped in the CONUS. might trade for the right micro head, like a TH500 or F500.

    [​IMG]

    [​IMG]

    [​IMG]
  2. J.Wolf

    J.Wolf Supporting Member

    Joined:
    Apr 29, 2003
    Location:
    Durham, NC
    Disclosures:
    Staff Writer - Bass Musician Magazine
    bump for a pre that sounds as good as it is strange looking :)
  3. bassfreakah

    bassfreakah Supporting Member

    Joined:
    Mar 26, 2011
    Disclosures:
    Endorsing Artist Ernie ball strings
    what are the switches for? ( on gain stage?)
  4. J.Wolf

    J.Wolf Supporting Member

    Joined:
    Apr 29, 2003
    Location:
    Durham, NC
    Disclosures:
    Staff Writer - Bass Musician Magazine
    I'm really not sure, and wouldn't want to comment incorrectly
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  6. bassfreakah

    bassfreakah Supporting Member

    Joined:
    Mar 26, 2011
    Disclosures:
    Endorsing Artist Ernie ball strings
    could we have a shot from other side to see under the tube layout?
    very sweet by the way!!!!
  7. J.Wolf

    J.Wolf Supporting Member

    Joined:
    Apr 29, 2003
    Location:
    Durham, NC
    Disclosures:
    Staff Writer - Bass Musician Magazine
    yeah, I will get some better interior pics up tomorrow. Thanks, and sorry for my lack of technical info
  8. Dee-man

    Dee-man Supporting Member

    Joined:
    Apr 6, 2004
    Location:
    SF Bay Area
    Free bump for an awesome TBer. I shouldn't ask, but could you compare this to a more standard tube preamp (Ag, Alembic, Kern, Read, Demeter....). Thanks, DM
  9. J.Wolf

    J.Wolf Supporting Member

    Joined:
    Apr 29, 2003
    Location:
    Durham, NC
    Disclosures:
    Staff Writer - Bass Musician Magazine
    thanks Dan, compared to the ones you mentioned that I'm familiar with, (demeter, alembic) it sounds more vintage/less hifi up top, and a bit more furry in the mids and lows, to my ears. I think of those mentioned as "hi fi tube", where as this is more "vintage tube".

    more pics as promised shortly
  10. J.Wolf

    J.Wolf Supporting Member

    Joined:
    Apr 29, 2003
    Location:
    Durham, NC
    Disclosures:
    Staff Writer - Bass Musician Magazine
    Here are some more pics of innards. Ps just played with the switches for a sec, they are both 3 position, and the changes are primarily changes in gain, There may be more subtle stuff happening but all I had was a couple minutes to check it out and that was the immediate impression.

    [​IMG]

    [​IMG]

    [​IMG]
  11. J.Wolf

    J.Wolf Supporting Member

    Joined:
    Apr 29, 2003
    Location:
    Durham, NC
    Disclosures:
    Staff Writer - Bass Musician Magazine
  12. bassfreakah

    bassfreakah Supporting Member

    Joined:
    Mar 26, 2011
    Disclosures:
    Endorsing Artist Ernie ball strings
    I dont know why i like looking at this so much?!.
  13. J.Wolf

    J.Wolf Supporting Member

    Joined:
    Apr 29, 2003
    Location:
    Durham, NC
    Disclosures:
    Staff Writer - Bass Musician Magazine
    :)

    Because its an awesome sounding symphony of well executed high end components, with a face only a mother could love?
  14. NKBassman

    NKBassman Nerd Supporting Member

    Joined:
    Jun 16, 2009
    Location:
    Winnipeg
    Sounds pretty cool. Definitely want this for some reason. Unfortunately I don't have the funds.

    Good luck with the sale!
  15. bassfreakah

    bassfreakah Supporting Member

    Joined:
    Mar 26, 2011
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    Endorsing Artist Ernie ball strings
    OK sounds good
  16. bassfreakah

    bassfreakah Supporting Member

    Joined:
    Mar 26, 2011
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    Endorsing Artist Ernie ball strings
    such a nice build!!!!
  17. J.Wolf

    J.Wolf Supporting Member

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    Apr 29, 2003
    Location:
    Durham, NC
    Disclosures:
    Staff Writer - Bass Musician Magazine
    thanks all. It is an extremely nice build, I think of it as a work of art
  18. bassfreakah

    bassfreakah Supporting Member

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    Endorsing Artist Ernie ball strings
    I think of it all day and all night long..................
  19. J.Wolf

    J.Wolf Supporting Member

    Joined:
    Apr 29, 2003
    Location:
    Durham, NC
    Disclosures:
    Staff Writer - Bass Musician Magazine
    There's only one solution.... Don't fight it
  20. J.Wolf

    J.Wolf Supporting Member

    Joined:
    Apr 29, 2003
    Location:
    Durham, NC
    Disclosures:
    Staff Writer - Bass Musician Magazine
    Still up for grabs
  21. bassfreakah

    bassfreakah Supporting Member

    Joined:
    Mar 26, 2011
    Disclosures:
    Endorsing Artist Ernie ball strings
    still trying to sell my first born...

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