“I just ordered the 9.0X . I also have a pair of Siemens E188CC/7308 gold pins coming. Curious, Did you upgrade the PC or Fuse. I don’t see anything listed about fuse value or if it’s even worth doing.”
I did not not change fuse, but I did change power cables that feed the PS along with the power cable that feed the phono preamp from the PS. Both made for a larger soundstage. The PS fuse is a 3A slow blo if I recall.
I also tried Siemens 6922 1960s NOS tubes in it. They are my second favorite, but the Bel/India (Philips SQ) was better overall. Something about there tonality that kept me going back to them. Amperex JAN USA 6922 were my third favorites and had the deepest, most slamming bass but are a touch in your face sounding compared to Siemens and Philips, both of which have great bass but not so in your face sounding. They also have a bit more decay that I liked. Herbies RX rings towards the upper half of the tubes also works wonders, but they don’t absolutely need them. System dependent.