Hi, Furutech fuses make a great upgrade however you do need to use the same rating / type (eg slow or fast blow, probably the former) as the factory recommend as they're there to protect. I've had two Rogue amps a while back and they're great plus excellent support from the two Marks. In my 88 magnum, siemens e80cc were much better than any of the 12au7 variants I tried though you should check with the factory whether the 180 circuit can support them also.
Good luck!
Good luck!