Raysonic 168

I have experimented with tube rolling the CD168. The two center tubes are reported to affect the RCA outputs and the outer two the XLR. However, my findings are the same as that repoted by Newbee on his CD128. Changing either the inner or outer pair will affect the sound from both the RCA and XLR outputs. I have settled for now on a pair of Siemens CCA 6922 in the center and a pair of Amperex White label 6DJ8 "D" getters for the outer positions. Seams to meld the Siemens and Amperex sound into one cohesive sonic signature.

Reb, Glad to hear it wasn't my imagination. It also explains why I wasn't able to get the sound of the sonic signature from the tubes I was using unless I used all four of the same brand. Interestingly it makes the permutations seem infinite - perhaps not so good for the anal folks. :-)

BTW, how do you like the 168? Anything to compare it against? Have you heard the 128?

Newbee, I will give all 4 tubes changed out to the same good ones a shot in the upcoming weeks to see If I can concur the inner and outer have effects on both outputs. I definitely can say just changing one pair at a time had large effect by itself, but if its even better with a Matched Quad than I will keep it that way, I just don't have access to my system right now to do any testing.

any conclusions?