Lon, now I'm playing CD #3 of this Jarrett box with which I'm very familiar. I decided to use the tubes Martin, the seller, sent in the CSP3 to start...three of the Russian input and output tubes Steve sends as stock but I did switch the rectifier to a 50's RCA 5U4G-ST that was laying on the table...I just couldn't bear to put in the straight, short Russian rectifier that was sent...not sure what it is. It's in the photo in the classified I bought from.
So the sound...very good, as has been described in the past, it adds weight and for me that's a good thing. By giving up a little transparency and maybe a little detail, I gain a warmer, weightier sound with a bigger bottom. I'll leave things as is for now and maybe try out the ZP3 soon...or maybe tomorrow. Mark.
PS...I actually like this setup. The Monoblocks are closer and more convenient to me so using their volume controls to fine tune volume works well for me.