Hi anthony8i,
I thought I was the only old-fashioned guy to love again that Santana's smooth and sustained overdriven tone. I see hopefully that I am not alone ! We're almost 2...
I play in the Santana tone style with a Gibson ES-335-TD from 1980 or a brand new chinese Hagstrom Viking. The amp I use is a Boogie MKIIA from 1979, on which I corrected all the bugs :
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I bought it to have the kind-of-Santana lead sound and that MKIIA does it all. Listen to "dance sister dance / baïla mi hermana" : it's faithfully that sound that I have with my gear.
MKIIA are unfairly disregarded. The MKI is "Santana", period. Only the MKIIB seems to have a good recognition, and the hype-must-to-have is the MKIIC+, but not for me.
A (wealthy) friend has a MKI Rev Eq 60/100, a MKIIC+ simulclass and a brand new MKV. We spent many hours in A/B comparisons along with my amp, and the closer to the MKI was the MKIIA without the need to dial much the knobs to set it in quickly.
So I would buy a MKIIA (or B at least) and work on it to debug the factory misconceptions. It's worth the job, trust me, and it's probably simpler and cheaper than building a kit, IMHO...
A+!