By principle it's right, what Gary said! Usually I'm supplying my DINO amps w/ NOS Tungsram ECC83's, except V2 (for the California sound), where I stuck in a NOS Tesla E83CC, because it gives the clean sound some more of this sweet chime. The output tubes already always are NOS RFT (Siemens) EL34's and I'll stick with it, as long as my stock this allows.
But Jon's amps now are quite different supplied. We've met us at the end of January for three days, as he's been here in Germany for rehearsing before the European IE tour. Besides that I've checked the four of his five DINO's, he brought over, we've tried some minor tweaks (to concretize the circuit for his JS Signature head, which will be introduced in summer) and we've tried out lots of different preamp tubes in different preamp spots.
Finally it has turned out, that we kept the tube's supplement as mentioned above, except for the input tube. As V1 Jon likes the NOS Valvo from the 60' best (not a Valvo labelled Mullard, but the 'real' Valvo). As for the PI tube he's decided for a Sylvania 12AX7 long plate, about which he's said, that it gives the amp some additional punch and makes it sound still bigger, but w/o loosing anything of its tightness.
Larry