THE Marshall tone for me, out of what I have had (which is a lot), was a JMP 2204. It is the one Marshall I've had that covered the gamut of my fav Marshall sounds, from AC/DC to Iron Maiden to GnR, Dokken, Ozzy NRFTW.
Hear it here, in a song I wrote for my best buddy ever:
https://www.soundclick.com/share.cfm?id=13313420
I've had 4-holers, JMP and JCM 2204/3s, boutique handwired versions of those, DSLs, JVMs, and Sc/Sv studios.
I won't give up my 1984 4104 for anything.
But, if I have to choose my ideal model of the Marshall sound in one shot, that Jmp 2204 is it. 2 things: I gave it a lower value bright cap. And, it was running thru an old cab with Celestion greybacks.
It had the low mids of the early ACDC records. And that sucker got super tight and gainy when pushed.
So, in my world, after hearing all the records and owning all the different versions, the JMP 2204 is the Marshall sound to me. 1984 4104(my fav) & JMP/JCM 2203 being close seconds. 4 holers right behind them, but a bit before my time, so not my primary definition of that sound.
Here's another clip I made that shows a pic of my setup back then.
https://www.soundclick.com/share.cfm?id=13310997