I discovered how close a Boogie can get to classic Marshall sounds when I had my MKIII and I could nail AC/DC tones with it and my '64 Gretsch with a halfback with EVs.
I think alot of the key to dialing this sound in is speakers. This is much harder with one EV in a combo. However, I have a vintage 2x12 Marshall Bluesbreaker cab that is loaded with well broken in G12Hs.
Also, the key is low gain, lots of volume.
Here is generally what the settings are:
Volume 1 set to 9 and pulled
Treble set to 9 and pulled
Bass set to 3 and not pulled
Middle 7
Master to taste, but 2 is minimum and 3-6 is much better, pulled
Lead drive around 3, maybe 4 at the most.
Lead master around 3 and pulled.
IIRC, my presence was relatively low, like 4-5. I just changed it to a different setting so I don't remember 100%.
EQ was set in a V, but more of a soft V. Yes, I am scooping the mids because the cab/speakers make so much midrange. Also, I am using a vintage Les Paul ('73) with PAF style pickups and/or an SG with a Maestro and vintage style PUs.
This is not going to be exact, but it is so damn close that I will never miss the Plexi. The key is volume, get it nice and punchy and not too gained out, that is how a real Plexi sounds. Use a clean boost to get you into more gain, like you would with a real vintage amp. Season to taste. I will record this in the near future and we can A/B it with recordings of my actual Plexi.
Damn, I love this amp!!!
Mike