The Mesa tubes are probably JJs, but they (Mesa) get tubes from other places, they don't make them, just test them and re-badge the ones that pass the testing and charge lots more $s for them...
The Tung Sols should be good (personally I'd try the new sensor Tung Sols before JJs I find the JJs a bit 2D and break up at 82hz (bottom E, in MP2), though not as big an issue in the MP1 as it has less bass than the MP2), I've not tried the Tung Sols, I know the JJs are nice and tight (fantastic feedback, best I've heard, they really sing...feeding back) but not as 3D as other tubes, but hey, depends what you're aiming for, they all sound a bit different. In the peavey you want it tight, clean and transparent, let the ADA make the tones.