All agreed, except...
YellowJacket said:
Perhaps you find the Celestion G12T-75s that come stock in a Marshall 1960a 4 x 12 aren't exactly the sound you'd like.
True, but he's using a 1975 Marshall cab. Unless the speakers have been changed, they will be G12M-25s or G12H-30s - probably blackbacks, but they're almost the same as greenbacks.
I've currently got a friend's '74 or '75 angle cab on loan with blackback 30s in it and it sounds *huge*.
The biggest difference (if you're going on recorded tone) is that the guitars will almost certainly be multiple-tracked, and even if they're not you have no idea what EQ/multi-band compression/enhancer or other tricks have been put on it. There's really no point in using a record as a benchmark for amp tone, because you can only ever approximate it.
If you're going on live tone, it may be the amp (Duals do sound thicker than Singles), or still the EQ/compression etc that's done through the PA, unless you can *only* hear the amp itself, which is unlikely.
Also, there is another problem - if the cab is original and hasn't been rewired - it's 16 ohms, and the amp only has 4 and 8-ohm outputs. This means that it's running a high mismatch, which does flatten and thin the tone a bit. A Dual has a 16-ohm output too, so you could avoid that. In the mean time, you could try rewiring the cab for 4 ohms and running it at the correct match - that will definitely darken and thicken the tone a bit. However, if the cab is truly original and hasn't already been messed about with, think hard about this because vintage purists can get snobby about non-original soldering (yes, I know it's stupid, but it's true) if you ever want to sell the cab. (Which I would strongly advise against!)