It was a surprise for me. I love the sound of tube heads but they never worked for me on a gig. IMO when you combine a tube head with a reflex cabinet the low end is WAY too loosey-goosey for me. Which is why they work so well with sealed cabs. Only problem is you can't get the type of bottom I like.
Don't get me wrong---I'm sure there are many who use a tube head and ported cab and it works great. Not for me, though.
I though it was just the nature of tube heads that they didn't produce the low end control I like.
Until I heard Tom's Reeves through a Flex 110. A very symbiotic relationship. Of course a SS amp will have a tighter low end. But the MVW cabs and tubes have a neat relationship. The looseness of the low end seems to be pulled in just enough to exhibit the type of control I like. And you have that huge expansive low end that tubes give but enough control that when you're on the bandstand you still feel that type of control that an MVW cab gives.
And a cool thing is that the different cabs sound different with the same tube head. The 110 and 210 Flex are about low end control and impact. I played a P Bass through a MAS48 with one of those crazy Fender 300 watt (?) heads. Humongous rock and roll sound. The 48 actually goes a bit lower and louder than the 210. But it's a challenging SOB to haul around. We're rethinking it.
My point is that they both sounded great with tubes but each cabinet retained it's character and strengths.
The 210 can sound like the sound that Nomatic and I gravitate to---big, fat, tight r&B/funk sound. Or grind for days.Those paper cone mids are actually covering the m ajority of the sonic spectrum. We're crossing them over lower than most. Because they can handle it .Or sound pretty and hifi. (Anthony Jackson-esque---he is the only guy on the planet that I would give a cab to)Or take your head off.
The 48 is huge, warm with a lovely top end. But---it takes effect pedals extremely well.
I've now played different tube heads through the MVW cabs. The Reeves is pretty much at the top of that heap, but the other tube heads I've tried work really well, too