The guys at ARC have it pretty well figured out. Tube rolling gets marginal, if any, benefits in the Ref 40 in my experience. I assume application in the Ref 10 is not much different.
5 responses Add your response
I sometimes get them from ARC but they are almost double the price you will pay at shops like The Tube Depot or the Tube Store which also provide matched pairs, although ARC claims to put the tubes through extreme testing and matching. To the best of my recollection from a few years ago the 6550Cs are about $100 each at ARC and 6H30P are about $50 each there. Hopefully someone on this forum can get you more precise current numbers.