Best 6JN6 for Berning ZH-270

Thanks for all the very informative responses. I also feel that Mechans is commenting also on the 12at7 and 5965, and it is very helpful. I am doing the tube switchings for my ZH-270, so any suggestions on tube switchings for ZH-270 are very welcome.

I talked to Allan and Andy already. Here I just want to get more information from different users.