I'm thinking of getting four single 12's to get the most out of this and still be portable. I went to Long & Mcquades around the corner from me and priced lower end kt's at 450 and the only high end name I could think of gold lions at 600. For such a good amp I can't see skimping 150 on power tubes. I'll probably end up ordering jj's from tube depot like everybody else.
I took my amp to a tube guy when it broke down, and he said, JJ's were the current best fit for the V6, mostly because, to his experience, they are the most consistent. I got 3 matched pairs, and they work great! Also, as cool as the blue glass sounds, you don't see it. When I changes the pre's, I didn't notice much of a difference in tone, but now that I think about it, my DI lost a lot of power.. One of the pre's was an Electro-Harmonix, the other two were TE. I have another TE 12AX7A in another amp.. I may grab it and see how it sounds with all TE pre's. For the record, I can load both cabs, amp, gig bag, guitar stand and 2 Basses in the back of a 2006 Beetle with the seat folded down. 2 trips in, because the 1X15 has casters ;-)
