"...3D, liquid, sweet mids..." - not the 6550's strong suit; EL34, yes.
After the NOS GE6550A - CJ ran out of 'em during the middle of Premier 12 production - I'm with Bbro and SED Winged C 6550C.
Regarding the 6DJ8/6922/7308 driver - here's a good opportunity to have some fun tube rolling. I've yet to hear a contemporary member of this family that meets up with any of the better NOS. Amperex Orange Globes are a safe choice. From current tubes, the Electro Harmonix 6922 is worthy and inexpensive.
After the NOS GE6550A - CJ ran out of 'em during the middle of Premier 12 production - I'm with Bbro and SED Winged C 6550C.
Regarding the 6DJ8/6922/7308 driver - here's a good opportunity to have some fun tube rolling. I've yet to hear a contemporary member of this family that meets up with any of the better NOS. Amperex Orange Globes are a safe choice. From current tubes, the Electro Harmonix 6922 is worthy and inexpensive.