Yes, sadly. Not even close. Harsh, brittle and very noisy compared to any NOS 5670. I picked up a bunch of NOS JAN 5670 tubes as well as a few of the NOS GE 5 Star 5670 series. The 5 Stars are my favorites. The NOS are all expensive compared to the Chinese tubes but they will probably last a lifetime. Seriously. They were built for that as well as numerous on-off cycles as well as extreme linearity.
