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Raysonic 168

Thanx for the responses on the 128. I see now the 168 has been released. I saw what Underwood Audio has done to the 128 as far as mods go, it looks like some things done in the mods have been incorporated in the 168.
Has anyone yet heard the 168? I am hedging my bet between the two for an upcoming purchase.
hockeydad
fatcataudio
107 posts
 
Mrtennis,

You deliberately called another dealer (me) to inquire about this product when you had no intentions on working with me on the purchase. You did not let me know you already had the unit and continued to talk as if you were an interested buyer. You need to work with your local dealer who supplied you with your CD168 (or whoever supplied it to you). That is the problem.
reb1208
518 posts
 
Undertow, its quite easy and economical to change the two .22uf film caps to whatever type you prefer. The XLR outputs are capacitor free, so you can compare your "experimenting". Although, there are probably some extra op-amps in the XLR signal path that may scew the results.
reb1208
518 posts
 
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.
newbee
4,790 posts
 
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?
undertow
1,033 posts
 
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.
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