Oh my ...this could take some time. But here's some quick and dirty
MKI: started the "Boogie" as we know it. 100 loud watts (IIRC), cascading gain, two voices but essentially a 1-ch amp.
MKII, IIb, IIC: ...all "evolving" models stemming from the Mark theme, with a variety of iterations which separate them. Don't get fooled into thinking III is better than II, or C is better than B; all have slightly diff voices and what you like for your taste is what matters. Oh, went two 2 channels, albeit shared tone stacks.
IIC+ : the "holy grail" of Boogie-dom. Tell ya the truth, I've never seen, heard, or played one in person but man do these command top dollar and attention. I'll let the experts give ya the goods on this one, but in essence is still a MkIIC ...just with added magic
MKIII: Mark goes 3 channel, but still with shared tone stacks. BTW, the GEQ is essential to tone shaping the Marks, IMHO ...ie if you want to use it as a channel switcher playing live. The various Marks come with or w/o the EQ as an option. There's 60, 100, and SimulClass which is the most signif aspect that separates these as there are
many varieties of IIIs out there.
Mk IV: yet another step that goes beyond the III in features, and EQ is standard. More ability to shape indiv chanels, and also shape the R2 channel, and tube options, a variac-like "tweed" setting ...lots to tailor your tone with here. Remember, though, one Mark is only better than another by virtue of personal tastes.
Caliber 22 and 50: name designates the wattage diffs. The 50 came with 6L6s, but I recall seeing one with EL84s IIRC. Both are 2-ch amps but with shared tones stacks.
DC 3,5,10: these are "dual calibers" which means that they are the successors of the calibers, but now with separate and discrete channel knobs for each channel, from gain all the way to reverb, so no "compromise settings" need be made as each ch is indep of one another. The 3 is 35 watts with EL84s, the 5 and 10 are 6L6 amps. All these had GEQ standard. Oh, and also the DC2 (I've never even seen one anywhere ...wonder how many were made/sold). The DC2 is 20 watts (or was it 22 "dyna watts") and no GEQ .
This is just scratching the surface as there are myriad little diffs from one to the other. But I hope I gave you a bit to differentiate the models you mentioned in your post. Post again with specific Qs and I am certain you will get very specific answers. Also, use the search as there is a wealth of info there.
Edward
