I just plugged the new umbilical in. I had to solder in the new locking connectors, so there will be no a/b'ing. Out of the gate there is less grain than the stocker. You don't need to backpedal, Hartwerger. This cable is revealing without being zippy. I am also using a coke bottle 6x5g zenith, it appears to be similiarly constructed to the sylvania G rectifier. I keep coming back to the 12sx7gt's I got from Jim McShane. They are very neutral sounding with a nice bass.
Ricky, this is such a nice preamp it really deserves the tweaks, imho.
Now, I can't wait for my new amp to arrive!