Best M8080 NOS tube for CJ preamp line stage?

Dre, just discovered this online:

6C4 tubes are available from Watford Valves of England as the Mullard CV4058 (military number) which is also known as a KQDD/K or M8080. These tubes are the best 6C4 variant that money can buy, and Conrad-Johnson uses them in their new PV-14L audiophile preamp. They told me they have never found a better 6C4 tube. They were made for Britsh military mobile radios and can really take a thrashing, as well as a minimum 10,000 hour useful life.

http://www.rickresource.com/forum/viewtopic.php?f=1&t=13899

Looks like CJ did me right. Wondering what they recommend for the phono stage--but the genalex sound better than those electro-harmonix 12ax7's that were in there initially.

Sometimes I feel like I need two amps--one for acoustic and the other for electronic music. The CJ MF2250 has never sounded better on acoustic folk and jazz, thanks to the tube replacement in the PV-15. And it's not even the "a" version. I'm driving Dali Helicon 400's, and have a Rega DAC with a Cayin CD-t23 transport, and a VPI Scout with an ortofon 2m black. looks like i can wait a while before I upgrade my amp. Still thinking about a butler or a moscode, a VTL or a Cyber or a Rogue, or a Cary or a Cayin. lol. i just don't think a 2500a would be a significant enough upgrade for a larger living space. But right now I'm happy with this set-up in my tiny 12x11 bedroom.

Watford's "6C4/CV4058 MUL/BOX ANODE" is 15 Pounds plus shipping. Any c-j lovers up for a group buy? MAYBE the price could be lower, and shipping cost per piece surely should be lower. I'd go for maybe a halfdozen. Contact me at jeffreybehr(at)cox(dot)net if you're interested.
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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.

Dre, tube rush was evenly distributed