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400+ problem

Discussion in 'Amps and Cabs [BG]' started by 810wmb, Sep 22, 2002.

  1. 810wmb


    Jan 29, 2000
    my 400+ has got a static shhhhhh sound running through it.

    i have tapped tubes. the power amp ones are good i think.

    the pre-amp ones i am not so sure of. replaced one (the first) didn't do it any good.

    i have a call in to mesa. they will get back in touch tommorrow.

    in the meantime, somebody tell me it will be allright.

    new amp, less than a month old, big gig saturday...
  2. thelastofus

    thelastofus Guest

    Jul 3, 2002
    Bakersfield, Ca
    hmm.....mine is noisy at times but if i do one of the following things it usually is pretty silent. turn the mids down (works on mine), push in the bright switches, adjust the ground filter and keep the fan on low...all i can think of?
  3. pd_5string

    pd_5string Admin: Accnt Disabled

    Jan 23, 2002
    Change your strings and get the high shelf adjustment back down to around 12:00-2:00 if you like bright stuff. I only have mine at 12:00 or less sometimes.

    Unplug your bass and see if it is just the head.
  4. 810wmb


    Jan 29, 2000
    sorry i wasn't more clear..this is a loud problem! not anything to do with tone adjustments or bass adjustments.

    i am checking this with everything set at 5 and no instrument plugged in. the static is loud, so is the popping. sorry for not making myself clear.

    talked to mesa today. they are going to send me some pre-amp tubes

    that's is kinda what i thought although, today when i fired it up it was static, popping etc for about 15 min, then nothing! back quiet as a mouse.

    i am still going to switch pre tubes out.

    any 400+ owners out there ever notice a loud pop when changing fan speeds?
  5. thelastofus

    thelastofus Guest

    Jul 3, 2002
    Bakersfield, Ca
    yea, mine pops when you change the fan settings

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