The earlier up to 85 2203s had 6 can cap filtering...but it's said the filtering stayed the same just done differently when they reduced the actual can caps. The Vertical inputs also did not have the board mounted pots, so easier to work on. We can debate on how some 800s in the mid 80s and on sounded worse, but the only sure thing that I know of with the earlier one are the higher powered PTs. Every single 82-83 800 had PT voltage at or around 500v. Leading to IMO a tighter and more aggressive amp. I just picked up an 83 2205, for a little over a grand which is a good price these days. Lore would have it a terrible amp BUT you just have to know how to dial it. 507v on the plates, gotta dime the channel volume and gain and its actually more open/organic than the later 80s versions I had...no channel bleed, and the clean is MUCH better on this than the 87 2205 I had that was also killer. It has more gain than a 2203/4 but less than a later 80s version..but boosted it's perfect.
Not for everyone but these amps are favored by Schenker and Norum, who get pretty nice tones.