Thanks. For me, the SLP05 is the best pre I've had. Hits the right strings...I still remember actually getting goosebumps the first time I hooked it up. Cary just started advertising this "Ultimate Upgrade," so it piqued my interest. The only upgrade (other than tubes) I half considered was maybe having the volume control changed out at some point.
Sounds like a good thing, if it won't change the basic signature of the pre, as suggested by the Cary pitch. Funny, though, some of the suggested improvements---removing stridency, improving smoothness and sweetness--aren't areas where I would think it needs improvement. Of course, less noise anywhere is welcome, a little tighter, more authoritative bass would be nice, too. Some of that, I think, has been addressed by the tubes.
@brf--absolutely. settled in on RCA VT231s in the four main and blackbase 6sn7w in the balanced. The new production EHX, imo, are the worst in the Carys...if that's all there was, I wouldn't have kept the SLP05. Haven't touched the rectifier tube, though.
@kdude66. do you like the LTA more than the Cary and the Valvet? if so, that's impressive, especially for its price!