JJs are actually made in the Slovak Republic and I find them to be pretty reliable. I have their rectifier tube in 2 amps and never had a problem. I think Chinese tubes get a bad rap that isn't quite deserved. An amp tech told me that JJs and Chinese tubes are really the only ones made to spec and some of the only tubes you can use for the cathode follower position. Don't know if that is true or not. You could also try a Ruby rectifier tune, it's just a re-labeled Chinese tube but tested for quality. I did have a sovetek and a Mullard (all under the New Sensor) go bad on me.