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DB750 pre-amp tubes

Discussion in 'Amps and Cabs [BG]' started by boo, May 21, 2004.


  1. boo

    boo

    Oct 12, 2002
    Netherlands
    Hi there guys, i hope you can help me out here. Wich brand is the best for replacing my Sovtek pre-amp tubes in my Aguilar DB750 ????

    Svetlana ??
    Ruby ??
    JJ Tesla ??
    Raytheon ??
    Tungsram ??

    Thanks
     
  2. There is lots of info on preamp tubes do a search.
    First of all what exactly are the tubes in your amp, are they 12ax7. There are alot of tubes that will fit that particular socket. What's wrong with the tubes you have? Don't you like the sound/tones or are they microphonic? I did some experimenting with tubes new generation and NOS (new old stock). I bought some NOS Telefunken (smooth Black plates) for my Demeter 201s but I only need two. I think you're Aggie might require more. Plus you have to find out what they do in your preamp. Some are gain, some tone, some effects etc. and changing certain tubes won't make a big difference. The gain and tone tubes make some diff. I really like the Tele's but they were expensive. I also like the new modern tubes by JJ, Sovtek, Electro Harmonics, Svetlana. You must try them and that can get costly.
     
  3. Garey

    Garey Supporting Member Commercial User

    Apr 23, 2003
    Northern California
    Artist Relations/Product Specialist: Mesa Boogie
    There are 3 12AX7's and 1 12AU7.

    I think a tube upgrade made a significant improvement in the (already great) sound of my DB750. I'm using 1 Telefunken and 2 Mullard ECC83/12AX7's...and a JAN/Phillips 5814A for the 12AU7. You don't NEED to go spend big money on rare NOS tubes...I had them on hand...but really each tube brand will have slightly different sonic characteristics. If you're really into it, you can swap different types around and see what suits your rig/style/taste best.

    NOS doesn't always mean better tone. A lot of times it does, indeed....but older production tubes usually were made under higher QC, as they were used in a variety of fields where reliability was key. IMO, older production tubes sound better.....some people call it snake oil....hype, whatever...

    I highly recommend a JAN/Phillips 5815A in the DB750. They are incredibly quiet, reliable, long lasting, and they sound great (although its not a huge tonal application in its positioning in the DB750). Reliability and no microphonics is key here....and one of these will run you max. $15.

    For modern production tubes I would try the JJ's or Ei's...or maybe even the new Groove Tubes 12AX7 based off a Mullard...its not cheap, but I hear its getting rave reviews. JJ's are great and well-priced from Bob at Eurotubes www.eurotubes.com

    If you venture into the NOS world...I highly recommend Gregg Levy of Hi-Test NOS Tubes (and Hi-Test Guitars). He knows tone, and has amazing product, as well as product knowledge in a guitar amp application. Taste test...see what you like, sell the rest at a small loss.

    IMO, anything is better than the Sovtek WA's they ship the amp with....and the EH 12AU7 went micro on me in less than 10 days. Aside from that the DB750 is AMAZING!!!! GREAT AMP!!!

    Aloha, Garey
     
  4. Garey

    Garey Supporting Member Commercial User

    Apr 23, 2003
    Northern California
    Artist Relations/Product Specialist: Mesa Boogie
    Doh! I just saw you are in the Netherlands!

    Ok, forget about Gregg Levy and Eurotubes....look around in Holland for the NOS Amperex Bugle Boy ECC83's, also labled Phillips/Miniwatt. These tubes were made in Holland and are SUPERB!! Of course you can also look into any other UK/Dutch factory tubes under the Phillips parent company...anything by BVA-Mullard, Brimar, Mazda....you should have a while lot better sources for NOS than we do over here...have fun!!

    Aloha, Garey
     
  5. boo

    boo

    Oct 12, 2002
    Netherlands
  6. Lockout

    Lockout

    Dec 24, 2002
    Illinois
    A bit off the original topic, but... I'm going to be ordering all new tubes for my DB728 soon (JJ KT88s and JJ preamp tubes), and I was wondering if I should get a set of JJ tubes for my DB680 while I'm at it... Have any of you DB680 owners (or former owners) tried replacing the stock tubes? If so, did you notice any change in the sound, and did you like the change?

    Would replacing the tubes in my DB680 be a good/bad idea or...what? :)
     
  7. Lockout

    Lockout

    Dec 24, 2002
    Illinois
    Bump.

    I tried searching but I didn't get a whole lot of information from people who have tried it.
     
  8. Garey

    Garey Supporting Member Commercial User

    Apr 23, 2003
    Northern California
    Artist Relations/Product Specialist: Mesa Boogie
    I only have experience with the DB359 and the DB750, and in both of those amp a tube upgrade made a significant difference, to my ears. Both amps sounded cleaner, clearer, warmer, fatter, with more dimension and character.....don't take that to mean it sounded like a different amp....we're talking subtleties...but its a definite improvement. YMMV

    Aloha, Garey