You know, I totally forgot about this thread. I use to own an ADA MP-1, into a Peavey Classic 60/60 power amp. I had two of them actually, one was stock, and the other had the 666 mod (basically a Mesa Recto type of tone. Both of them were really great preamps, I absolutely loved the tone. I would use the modded one for rhythms and the stock one for leads. Always got compliments after shows. The stock MP-1 is very versatile and a good cutting lead tone. The rhythm sounds (to me) leave something to be desired. But the 666 mod really helped that out. I never tried the 3 tube mod but ya know...due to this thread bringing back memories of that cool preamp make me want to get another one. I might have to do that.
I only got rid of my MP-1/Peavey 60/60 rig to get a 5150 btw. The 5150 was good for both rhythm and lead and sounded killer for either use
~e.a