I'm well aware that transformers make a difference in the sound, but I was under the impression that Duals and Triples used the same transformers - rectifierguide.com only gives the transformer numbers for Duals I guess. Sadly my own Triple G is so rusty the original numbers are long gone. I can't seem to find a resource online that lists the transformer codes for Triples, but they must be different.
As for things slipping through, yeah of course there's always anomalies in production, QC failures etc, but that's a totally different topic. I'm sure there are rectifiers with the wrong spec components installed out there, but that's not really the same as comparing two healthy, built-to-correct-spec amps.
Maybe I'm being too mechanical-brain about this anyway though, they are 20+ year old amps with component drift and who knows what else - mods, repairs with on-hand parts, etc.
Just seems like there's a lot of BS around it. I'm sitting here with the Rev G Dual and Triple on an ABY switch and in a blind test I picked out the Triple as having more mids (same room, same cab, guitar, and front panel settings) - ever so slightly though, they are extremely close - definitely not huge and obvious to me.
But at the same time my sample size is just these two amps, and it's not like I've gone through and checked every component value or swapped every tube to make it a scientific test. My point is that even with both of these amps in the room with me right now, I'd hesitate to hop online and start telling people "oh, Triples have more mids" because I'm not completely confident in saying that - but there are a lot of people who do that.
Or maybe my ears are liars.