I'd be wondering what the serial was for the older 412 with straight shell and slanted baffle. It might be the more desirable early 2000's cab with the slightly darker V30s. If you had the number I could tell you if it was from that era.
Those OG 3-channels can sound glorious too. It looks...
IMO SOH has much better sound quality. I love the songs on RIB but I tend to prefer darker tones, and RIB is the opposite.
However, when I hear the word "thrash" I instantly think of the RIB tone/mix.
If the cab is a 412 with mono 16ohm and stereo 8ohm plugs but does not have a 4ohm switch, then you can always run two cables.
You can run each cable from a 4ohm tap into each side of the 8ohm stereo cab.
I used to run like this with my single rectifier going into a switchless cab that was...
You can remove the stock shim to make it 12, and then use floyd shims(the ones with holes for the screw to pass through) to bump the outers up a hair.
They are tone-suckers, but if you only use one or two of the .2mm shims it is really not enough to notice.
Use one under the 5th string saddle...
Yes and also they can be EQ'd and/or boosted to probably get quite close to one another. Even a bunch of stock revGs will likely all sound slightly different from each other.
I'd say get the scary, because it is the instant do-it-yourself and reversible mod that can be used on many other amps also, so it's hard to go wrong with that.
IDK, you might get more out of them now if you do want to sell.
I got a bunch of the sqaure beijing type from Nesstone a few years ago. Right before all the madness started with covid and wars.
I also scored a bunch of the old mesa 420 coke-bottle 6L6 for cheap. They are one of the best tubes...