I have found NOS BRIMER 6x4 England
EZ90 Black Glass Smoked Vacuum Tube as the best. I am using one in my Eastern Electric Avant preamp. It is a little pricey but worth it.
@couger4u , on your suggestion, just sought out a Brimer EZ90 from viva tubes for my Lamm, installed and can't express how much I love it. Thank you. Enjoy the music
I did some research and I ended up with a Sylvania 6X4 green printing with the triangle logo. $15 and better sounding than the Mullards I had previously in my LL2.1 and LP2.
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