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Mesa 400+ Preamp Tubes

Discussion in 'Amps and Cabs [BG]' started by bassboysam, Apr 24, 2010.

  1. Can someone explain to me the different functions of each of the 4 preamp tubes in the Mesa 400+? I just want to know what to listen for when experimenting with different tubes.
  2. suraj


    Oct 1, 2008
    Mumbai, India
    Good question..subscribed..!!
  3. Foz


    Jul 26, 2008
    Jax FL USA
    the pre tubes are numbered v1 thru v4 from right to left from the front of the amp... see attached

    Attached Files:

  4. So V1 is the gain, V2 is the tone stack, V3 and V4 are the phase inverter and the driver?
  5. Andy L

    Andy L

    Mar 16, 2008
    Anyone who knows?
  6. Yeah pretty much, v2 also provides drive for the effects loop.

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