I have tube rolled most EL34s - NOS variety.
If you ever get the chance to get metal based Philips EL34s, do not hesitate!
They outperform every other NOS variant including Mullards XF2s and Amperex DD brown base getters.
The transformative effect is 10x better by way of analogy from switching over to NOS from New Production EL34s.
I have also gotten hold of the GEC GRAYglass KT66.
Can't wait it try them out in my Torii MK4.