tube question for ARC Ref 3 users


Are you using a standard 6550 C tube in power stage or have you found other solutions? I'm using 6L6GC at the moment. My humble opinion is that sound is better with 6L6GC (better resolution with same musicality). Any other ideas?
mkilpi
If the 6l6GC is the stock tube that ARC used to ship with all REF3's, than I prefer the sound of the 6550C.
ARC initially shipped Ref 3 with 6L6G in power supply. They soon switched to 6550C. They apparently found it to be more extended/resolving and to controll bass better.
PBB, actually I had heard that the pros at ARC switched to 6550C because of non-pro customer findings.