Alright I have my impulses ready. The signal chain was a Steinberg MR816-X to a modified Presonus Eureka pre-amplifier. I recorded the top left speaker of the Mesa/Boogie 4x12 cabinet. The amplifier was a modified Crate Blue Voodoo. One 'program' is with a SM57 microphone centered on the speaker an inch away from the grille, the other is an Audio-Technica ATM25 in the same position.
These were captured using Nat2 so I think they will only work in Nebula registered copies. The programs will be located in the "REV" category in the Nebula browser.
Download Here [4.75 MB]
And here is a sound clip, I think I clipped the main bus for a second on the left guitar
mesaboogie_nebula.mp3 [900 KB]