What is the best sounding GZ34 / 5AR4 rectifier tube you've ever heard?

Looking for experienced opinions. Is there a holy grail?

Thanks!

tablejockey Details Discussions Posts This discussion Message User 4,078 posts 08-12-2022 at 08:35pm Copy Comment URL Report Comment Edit Delete Rectifier tube used as tone control?
mattmiller Details Discussions Posts This discussion Message User 1,552 posts 08-12-2022 at 08:49pm Copy Comment URL Report Comment Edit Delete The best 5AR4 is the brown bottom Mullard made in the UK. I had one on a Modwright SWL 9.0 Signature edition Pre amp. Matt M
slaw Details Discussions Posts This discussion Message User 23,495 posts 08-12-2022 at 08:58pm Copy Comment URL Report Comment Edit Delete Thought I remember reading a rectifier tube /rolling, wasn't that consequencensial to SQ.