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?
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.
Mkilpi, what do you think of the Tung-Sol 6550? Is it a Tung-Sol original (50-60's version) or a recent version? I've heard some say that a original Tung-Sol 6550 from the 60's is the way to go, though I haven't experimented yet on my own.
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