Best M8080 NOS tube for CJ preamp line stage?

Have tried different valves in my cj classic pre se.Have found the mullard m8080/cv4058 nos valves to be the best.Upgraded my classic to se.This was a excellent mod,well worth the money.Have had issues with left channel tube rush getting noisy.Have you had any problem's.

Nos mullards are hard to find.Conrad Johnson have replacments.I was lucky enough to find 20 sets 1972 at a very good price.

The origional tubes in my pre were m8080's.The second set which I purchased through cj were cv4058's.These are both mullard's but with different codes.I think the m8080's are their premium grade tube.Cj apparrently bulk purchased nos cv4058 mullard's as my research and trial's have shown this to be the best tube for the classic.Let me know what tube's you are currently using.

Hi Sabocat,I also have a cj phono.Tea2 upgraded to se.Came with Russian mullard 12ax7's.Have tried nos Siemen tubes but have gone back to mullard's.Getting back to your cj classic pre.As your origional tubes aged did you experience more tube rush in the left or right channels or was the tube rush noise even between the two.Dave.