Amperex USN-CEP 7308 is one of the finest. The Mullards are very good also.
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The Amperex 7308's that Mofimadness mentions were always my favorite 6DJ8 variant.
I just stumbled upon an old box load of tubes that I used to use in a BAT VK-51SE & BAT VK-P10SE w/ Super-Pak phono stage. I knew I had the box somewhere, but I couldn't find it. Lot's of 6H30's, 7308's, 6922's even some 12AU7's too. I'm stumped where all my 6SN7's are though, I thought they'd be in that box too. Now I just have to find a tube tester. ;)
FWIW, I have owned 3 CJ preamps (PV14L, ACT 2 and now GAT which is the same 'generation' as the ET3SE). The ACT 2 was not as susceptible to tube rolling, but I have found that going from the stock EH to Amperex 6922 to Mullard CV2493 (in my system, the Mullards MUST be used with EAT Tube dampers)...I found the preamp did adjust a meaningful amount. The voicing of the component did not change materially, but I did get a much lower noise floor with the 2 replacement tubes vs stock. I also found a much 'stronger signal' with greater fluidity with the Amperexes over the EH and much greater sense of linearity with the Mullards (which incidentally are the quietest of all...though that is probably tube-specific, as in literally the 2 specific tubes I got from the dealer).
I found the CJ GAT reacted favourably to isolation and damping on top (and by a considerably greater margin than tube rolling). Have not tried the ET3SE. Hope that is somewhat helpful since ET3SE is same tech/generation as GAT. Good luck.
I'm using Voskhod 6n23p which is a Russian 6922 variant with excellent results in my c-j Classic 2 SE. I tried a few EH and they were noisy either right off the bat or very shortly after install. The 6n23p tube sounds better in my opinion, well balanced, excellent dynamics , excellent mid and highs. This tube is rugged,very quiet, and long lasting, 1.5 years with no problems so far.