Unfortunately my LCD2 are the Rev 2 non fazor. I was a little miffed when I heard about them and by then RWA had stopped doing the fazor upgrade. I do however have an upgraded cable from Norse/Norne Audio which improved things no end. Considerably better than stock LCD2 and LCD3 fazor
The Cassabria can use any of the ECC88 or the ECC83 at the flick of alittle dip switch and after much dicking about with myriad valves have found a 5751 JAN from GE 1967 to be head and shoulders better than everything I've tried.
Unless you are giving up HP listening try better cable and valves