Rogue Cronus Magnum 2 tube rolling

Nope, waste of money.  Tried it on my Cronus Magnum 1.

It is always nice to have a spare set of tubes available to diagnose possible issues with any piece of tube gear, with that said go ahead and get a set for the 12au7 spots in your preamp and I would recommend the Psvane T Series Mark III Premium tubes at about $75.00 a pair, I run a pair in my Lamm LL2.1 preamp and my Jadis tube dac also run the 12 at7s in my VTL amps and the 12ax7 in a ASL headphone amp. I have had nothing but good things to say about the Psvane premium tubes and have settled on them over all the NOS tubes I have tried and have become my go to tubes. Good luck.

We a friend did a test of 12au7's, about 8 different ones.  Psvane were not near the top.
Mullard won, GE second.  Both NOS.
Personally I'm using Philips JAN and RCA in my amp.