Tube recommendation for Audio Research LS-2b?

I have a ARC LS22 that I use sometime and use to use the LS2B. If you want a nice improvement and not spend big, try these. They work very nicely in the ARC gear.

http://www.tubemonger.com/Matsushita_Japan_6922_E88CC_Mullard_Tooling_NOS_p/591.htm

These are also very nice sounding in my ARC gear.
http://www.tubemonger.com/Tungsram_E88CC_6922_MINT_NOS_NOV_1973_HUNGARY_p/1108.htm

If you don't mind spending a little money.

http://www.tubemonger.com/Mullard_MPs_MINT_NOS_1967_MIL_7308_CV4109_E188CC_B_p/2000mb.htm

I also like the Amprex 7308's but they also are quite expensive now.