Charles and everyone, I'm up to my elbows in new stuff (OK, my ModWright Sony HAPZ1 and Coincident Triumph Extreme IIs) and trying to get my house up for sale. Hence, the delay in getting a serious, or even casual, A/B/C with my 101D tube collection. It is clear to me that these are good sounding tubes, and they are certainly burned in now. I was a little put off by the build quality in the pair I received. I have found them to be pretty noisy until they have been on for 10-15 min. These probably should have been B stock tubes. I was just too busy to hassle with trying to send these back to China, plus, I couldn't have gotten a replacement pair, so I just kept my mouth shut.
I suspect the factory is having some trouble in early production runs making the tubes. I think they will ultimately get things worked out, and we will all be so much the better for having a reliable supplier of primo 101Ds. It is a superb tube, and I can imagine a robust source of great new production tubes will inspire more equipment designers to take notice.
Charles, I am eager to benefit from your assessment. Your system, life, and personality are a bit more stable than mine!