Howdy, I'm curious if anybody out there has any experience rolling 12AX7s in the cathode follower position, particularly one that's buffering a tone stack like in a 5F6-A Tweed Bassman or similar designs (for example, I've built Trinity 18-Watt Plexi and TC15 [Vox clone] amps with a similar cathode follower). Since the cathode follower doesn't really add gain, I'm curious if it even matters tonally what kind of 12AX7 is in there, or if different makes of 12AX7 have different tone or effects (e.g. touch sensitivity, etc.) in the position. Anybody out there have experience trying different new production or old stock tubes, and any descriptors for how specific 12AX7s sound in there? Request: There is a lot of anecdotal discussion out there claiming that a lot of new production tubes (especially newer Russian-made 12AX7s with spiral filaments) can't stand up in the cathode follower position. PLEASE, I'm not really interested in re-hashing this discussion and making this thread about which tubes can survive as a CF, I'm just curious if you've compared different tubes tonally as cathode followers and what you think. For what it's worth, the consensus from my reading on the "which tubes can survive cathode follower" subject is that Sovtek 12AX7WA, WB, and WC tubes, any Chinese 12AX7s, and pretty much all NOS 12AX7s can handle use as a cathode follower, though plenty of people claim to have used the "not good" tubes without problems.