I like 'em!!! These were distortion rated at 6, on a scale of 1-10 by Groove Tubes. Get this: CHP stands for.....Chinese "High Performance". They are some nice sounding tubes. They made my previous Chinese Ruby 6L6's seem a little too bright and harsh by comparison. The character of the distortion seems a bit richer; more complex. It's a subtle thing, but noticeable. I can give these a thumbs up. But, they were $55 for a matched pair of mediums at GC.