I've got an extremely nice NOS quad of Ratheon 6sn7gtb tubes I'd been saving for the right preamp. I loved these tubes in every piece of equipment I've tried and was keeping this quad as a backup, but the fact of the matter is that they're collecting dust.
I believe I'd paid $160 for the quad and I'm not sure what they go for now, but I'd like to recoupe a quick $100 shipped for an excellent set of tubes.