Im getting absolutely incredible performance with the supplied stock tubes, with the exception of a pair of n.o.s. Telefunken Pcc88 in the phono section of my Chenin. Also a recent interconnect change from my V.P.I. termination box to my preamps phono input had a staggering effect.I urge anyone with V.P.I.s new signiture tone arm wired with Nordost Valhalla to try out Nordost new line of the Frey interconnects in this area of your system. I bought one used burt in pair last week . The change to my sytems performance was immediate....I have had my Chenin for two years ,Im just starting to hear what it can really do.