Yep, G12-T75s. If so many people want to change to V-30s or Greenbacks, why don't Marshall do it as an option? The different speakers can't be more expensive to manufacture, especially if they are manufactured abroad.
Not sure why Marshall doesn't offer different speakers in their cabs, without raising the price to just plain outrageous. The 812A50, the 50th anniversary cabs, man those cabs are $2500!!! A complete rip-off if you ask me, I'm sure they sound good, but do they sound that much better??? But, looking at the price of a regular 1960A cab, it's $1000 for a new one. I paid $350 (including shipping which was $50) for my cab, & IMHO, it sounds just as good as one of those expensive-assed cabs, & I had enough change left over to buy a 100w head...
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Each speaker has it's own character (which I'm sure you already know this, but...), like the T-75, everyone says that they're "mid-scooped", which they're not (IMO anyway), they just don't have as prominent mids as a V30 or such, & have a little more high/bottom end than other speakers...
I have 5 different Celestions, & while they're all similar in a way, each one has it's own character that makes it a little different from the others....
Personally, I'm not sure I care for the sound of the low-wattage paper-coned speakers. But then again, I'm not into cork-sniffing either. I have a pretty good appreciation of what sounds good to me and what sounds horrendous. The swapping of tubes, either pre-or power- amp seems to me to be the ultimate in snake-oil snobbery. So many other factors play a FAR more dominant role, not least the playing style. A major overlooked factor is the ability and knowledge to be able to dial in a usable tone whatever your gear.
Just my rant.
Yeah dude, I got into the tube-rolling for a while, but while some swear by it, the changes it made to my gear were so minute it didn't make a fuck. But, I will say your speakers have a bigger impact on your tone than just about anything, again IMO...
P.S. I have had the dubious pleasure of playing through some MG and AVT cabs recently. Christ on a Bike, they are trash.
Lol...I bet if you put decent speakers in those cabs, they'd sound a lot better...