I use a WGS Green Beret and a Reaper, but I would imagine a G12H-30 would work well. I would also keep playing through the Chromeback and let it break in. My 10" VHT speaker sounds awesome now that I have had it for a year.
I use a NOS RFT in V1 and a Shuguang 12ax7B that came with my Ultra. I have about 10 of the Shuguangs and 4 are really nice sounding while the others are fizzy or noisy. I also have had good luck with a RI Tung Sol in V1.
I have the original Special 6 combo. I run it into a cab with a Celestion Vintage 30 and it sounds great. Swapped the stock tubes for a Sovtek ax7 and a vintage Jan-Phillips 6l6gc.