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Compared to my Mk V 25, or my old Formula Pre, or my older Tri-Axis. I'm having trouble getting a warm, full clean tone from channel 1 on my big Mark V. But I tried swapping V3 anyway, since it affects Ch1. (Left V1 alone, since Ch 2 and 3 sound fine) The 12AX7C was a bit lower gain and...

The manual on page 40 simply says that the external control jacks will override the footswitch, it doesn't say don't have them both plugged in at the same time. I called MESA tech support when my Mark V head stopped passing audio in channels 1 and 2. Still works in channel 3. Gary said you use...

Just asking if anyone here knows, before I go to the trouble of pulling the chassis. I really like the MkV:25 clean channel, with the extended range of the mid control (at max pretty much defeating the tone stack). I'm familiar with the concept from Allen Amps, among others. Basically use a...

I posted this as a reply to a Formula Pre topic, but thought it was worth it's own thread. For anyone struggling with muddy tone/low volume from a preamp like the Formula or Recto, even to a lesser extent the Tri-Axis: I just discovered how *crucial* impedance matching is for the Formula and...