I have a Mesa MK IIA head which will be headed out to Shakedown in the very near future. I like what I have been hearing from yours and between the post on April 7 and the post on April 21 it sounds like you are really starting to get the amp dialed in. There is a noticeable increase in tonal quality between the two posts. Good work and keep it up!!
Glad you're liking what you hear. Between the two post dates you note, the amp had some additional tweaks done by Joe. I agree it's improved (again!). What I'm struggling with now is that while the Boogie sounds great, I don't think it will nail the 80s Jerry Twin thing quite right. The voicing is too different, most noticeably in the upper register where the Boogie seems compressed/congested vs. Jerry's tone.
The Jerry tone I'm chasing has that crisp attack followed by a complex, open "bloom" that's not really as clean & round as it is splintered/phasey/dirty. Words can't do it justice...for me I just have to listen to some of those April 1984 soundboards where Jerry is pretty high in the mix, 4/19 and 4/20 especially ... listen to 4/19 Terrapin segue starting 4:50 or so for what I'm talking about. His notes just spit and smack and shimmer so beautifully:http://archive.org/details/gd1984-04-19.sbd.miller.118658.flac16
For what it's worth, the closer I listen the more I'm convinced that there are some really crucial things missing from known Jerry mods as well--which shouldn't be surprising given that the guts of his Twins have not actually been seen by anyone here (at least as I understand it). Thus the title of this thread
I understand the arguments along the lines of it's in the hands, it's in the clipped power amp, it's in the loudness (stressed JBLs), etc. All true to some degree, sure--and I've tried some of it, just ask my neighbors
But there's some secret sauce in the preamp that eludes us ... and I can't give up my obsession!