Best M8080 NOS tube for CJ preamp line stage?

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 Mullard M8080 that c-j sells is New Old Stock. A few years ago, soon after I bought my MET-1, the 6-channel preamp that uses M8080s, I bought a BUNCH of different 6C4s/6135s. Virtually all the 6C4s were highly microfonic and so bad I tossed them in the trash. I understand that the 6135 is a heavy-duty version of the 6C4, and the few I found, maybe a half-dozen, are not microfonic and sound plenty OK; I use them in the surround and SW channels. I use only the M8080s in the front-3 channels and have had NO problems with them. I have a trio that I removed from the front-3 channels after about a thousand hours that are just lying about; if you want them, they're yours for $15 Priority Mailed to you in the US. E-mail me at jeffreybehr(at)cox(dot)net if you're interested.

I hope you enjoy your c-j preamp; I sure love mine.
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Dre, the original M8080's were indeed Mullard. The replacements, sent by CJ through one of their respected retail dealers, were not. That being said, the pre-amp has never sounded better. I cannot identify these tubes but they seem to be really good. BUT, if i could find some NOS Mullard or RCA, I would try those as well. Found a few dealers on line that seem to have passed through the audiokarma filter (a bunch of DIY guys mainly), and the prices are a little higher than for the new Genalex 12AX7 tubes, which run roughly 40 bucks each. Check this out and let me know what you think:

https://www.tubeworld.com/index_high.htm

Jeffrey, thanks for the offer. I sent you an email.

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.