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Mesa Boogie 400 info anyone or VS. Aguilar 359

Discussion in 'Amps and Cabs [BG]' started by Flat Bass, Sep 29, 2003.


  1. Flat Bass

    Flat Bass

    Dec 8, 2002
    OK there I know someone who has a MB 400 OK. He says that he uses 6L6 for powertubes in it? What gives? I thought that the 400 had 6 6550 tubes in it and the 400+ has 12 6L6 tubes in it? Am I missing something.:rolleyes:

    Also how would a MB 400 with the 6550 tubes compare to a Aguilar DB 359?
     
  2. Flat Bass

    Flat Bass

    Dec 8, 2002
    bump!
     
  3. The early versions of the 400 had 6X6550s and the later ones switched to the 12X6l6 configuration that they use in the 400+. The 400+ got a beefier power supply and expanded EQ. I prefer the sound of the 6550 ones, but they all sound pretty great. Can't offer any real opinion on the DB359 because I haven't heard one, but all the other Aguilar stuff I've heard sounded deeeeluxe! Really smooth, less aggressive than the Mesas.
    You probably couldn't go wrong with either...Good luck.:D
     
  4. Caca de Kick

    Caca de Kick Supporting Member

    Nov 18, 2002
    Seattle / Tacoma
    I have a Mesa Boogie BASS 400. Yes it should use 6550's but you can use 6L6's, it'll just make a little less power of you do.
     
  5. Flat Bass

    Flat Bass

    Dec 8, 2002
    JUst want to make sure that I can easily put 6550 tubes into the place where this guy has put the 6L6 tubes.
     
  6. 6550s and 6L6s are not direct replacements for each other. You need to mod the amp to change from one to the other. Also, putting 6550s where 6L6s were won't gain you anything. They are more powerful tubes but the amount of power the amp can deliver is limited by its power supply.
    Again, there's a version of the 400 with 6x6550 and a version with 12x6L6s. There wasn't a version with 6x6L6 as far as I know. If the 400 in question is using 6X6L6, they're the wrong tubes.
     
  7. Flat Bass

    Flat Bass

    Dec 8, 2002
    That is exactly what I thought. I do not think that the guy knows what he talking about. He says that he is for sure that there are 6 6L6 tubes in it because he said he has replace em before. Would this mess the amp up if they were meant to have 6550 tubes in it? What if I got it and put 6 6550 tubes back in it?
     
  8. Caca de Kick

    Caca de Kick Supporting Member

    Nov 18, 2002
    Seattle / Tacoma
    The amps have different model names. The 6-tube amp is called the BASS 400, while the 12-tube amp is called the BASS 400+. We are not taking about a 400+, we're talking about the original 400.

    I have owned my BASS 400 for 14 years. When the tubes went out in it the first time, I drove to Mesa Boogie Hollywood where the guys there sold me 6L6 tubes to put in it, and so for 10-11 years I always ran 6L6 tubes...I didn't find out until a year and a half ago that it originally was suppose to run 6550's. But I know for sure my 400 will run just fine with 6L6's, just a little less power. Nothing has hurt the amp in doing this.
     
  9. There are two versions of the BASS 400, not including the 400+. The original 400s ran 6x6550s the later ones ran 12x6L6s. The 400+ uses 12x6L6s too, but has a beefed up power supply and expanded EQ. I'll buy that you can run 6L6s in an amp meant for 6550s, because 6L6s draw half the current of 6550s at the same plate voltage. I wouldn't try it the other way around, though. It's amazing that Mesa would sell you the wrong tubes, though....
    Putting 6L6s in an amp designed for 6550s will result in considerable power loss. Half to be exact. So while you were using 6L6s your 300W amp was only able to put out 150...