mesa boogie 400

Discussion in 'Amps and Cabs [BG]' started by saveferris1346, May 28, 2002.

  1. saveferris1346


    May 13, 2002
    i saw an auction for a mesa/boogie 400 bass head. now i know that there is such a thing as the 400+ but this one says 400 on it. visible it looks identical to a 400+, so i think the + might have just gotten scratched off or something. if you have any info please get back to me asap. thanks
  2. Pre EB

    Pre EB

    Mar 15, 2002
    Denton, Tx
    That's the model before the 400+. It has 300 watts while the 400+ is sportin' 500 watts. I think the EQ is different too. Both kick butt.
  3. If you can handle the fact that it has less power it might be a good choice. Retubing a 6 (power) tube amp is a lot cheaper than one with 12.
  4. slacker


    Nov 27, 2001
    Portland Oregon
    The Mesa Boogie 400 is the "father" of the 400+. It comes in at ~200watts. Aside from the power rating (6 less tubes) and the EQ (one less slider) it is essentially the same. The 400 is a great amp I used one for around 8 years, sold it, bought everything else under the sun to replace it, and finally gave up and bought a used 400+ a few weeks ago.

    It may be noted that a certain bassist, formerly of Wings fame, uses a Mesa 400 w/2 Mesa 2x15's as his live rig!

    BTW, the Mesa 400+ is 300 watts *RMS*, 500 watts is the *Peak Power*, and a bit of an exaggeration!

    Wattage, here, is rather a moot point however, as both amps are capable of extreme volume. I don't ever recall anyone asking me to turn up the Bass 400, but then there are a lot of things I don't recall.
  5. lo-end


    Jun 15, 2001
    I thought Paul was dead. ;)
  6. Flat Bass

    Flat Bass

    Dec 8, 2002
    Why would 6 extra tubes be added to give only 100 more watts. If the older one had 6 6L6 tubes and was 200 watts. How does the newer one have 12 6L6 tubes and is only 300 watts?
  7. (psycho correct me if I'm wrong) It is my understanding that a 6L6 can output 25 w rms max. Ampeg makes the B4 with 4x6L6's it is rated at 100w. 6x6L6 should be 150 w. 12x6L6 should be 300w. In any case, these amps sound great with the right cab.
  8. Did the 400 (no +) use a different tube type therefore requiring less of them?
  9. thelastofus

    thelastofus Guest

    Jul 3, 2002
    Bakersfield, Ca
    if the 400 is the "father" to the 400+ is it safe to say the buster is the fathers little brother? The Buster sounds a lot like the 400...?
  10. Talk about old thread resurrection!

    The 400 had 6 6550s in the power section, and was about 300W. The 400+ has 12 6L6s and is still about 300W. You'd be very lucky to get 25W/tube out of a 6L6.
  11. Flat Bass

    Flat Bass

    Dec 8, 2002
    That does not make any sense at all. Why would 6 more tube be added to do nothing? Just an extra expense?:confused:
  12. Rickenbackerman


    Apr 17, 2001
    Laurel MD
    Some 400's had 6L6's instead of 6550's.
  13. 6L6s are way cheaper than 6550s.

    R-Man: I didn't know that some 400s had 6L6s. Cool, you learn something new every day.:D
  14. It makes sense if Boogie's intention was to change the tone of the 400+ from the original. While I could not speculate how this tube change would affect the tone, I'm quite positive that it would do something to the tone. Maybe the change had little to do with power.
  15. slacker


    Nov 27, 2001
    Portland Oregon
    Perhaps the 6550 power section was a little too close to the SVT power section. Either in tone or maybe in violation of patent laws.

    I have never even seen a 6550 used in a Mesa bass head. What years? What was used in the D-180?
  16. mthoople


    Nov 1, 2001
    Denver, CO
    Mesa Bass 400's came with both 6550 and 6L6 tubes. I've have two and one has screen resistors appropriate for 6550's, and the other has screen resistors for 6L6's (soon to be changed). I have Sovtek 6550WD's (with 6L6 size bases) in both to retain the original tube clamps (easy to swap in cheaper 6L6 backup set). I thank the Lord (Valve) for these fine tubes!

    Also, the schematic from Mesa calls for 6550 tubes, but then has 6L6 penciled in next to it.

    As to the change from 6550 to 6L6, I've heard the same story as PBG related.
  17. We still have the Sunsphere, Knoxville's giant raging hard-on of construction offices. There's also the World's Fair Ampitheater, but due to age and wear, it's slated to be torn down soon. It looks like a huge bra. So twenty-one years later, we've got a bra and hard-on. This town sucks.
  18. Flat Bass

    Flat Bass

    Dec 8, 2002
    OK I talked to a guy at Mesa. The 400+ is 300w rms and a 500w peak. The 12 6L6 tubes are for the tubes not to work as hard there for you get a much cleaner sound. The older regular 400 is what you would want to get for a closer SVT kind of sound because you are able to drive the tubes harder. He said the more tubes the longer they will last because they are not driven as hard and he suggested two years to change them.:)
  19. slacker


    Nov 27, 2001
    Portland Oregon

    Cripes, that was 21 years ago? Now I feel old, really old.