I have tried most of the big brands but I keep coming back to these tubes in my CJ PV12. They are quiet and reliable with top notch sound quality and a relative bargain at the moment.
There was three different construction types on the tubes I received. One was definitely a RFT. Two had tags on the getter support the third one didn't. Since I needed four for my preamp these didn't work. Just added to the collection.
These tubes worked well in my Mastersound Reference 845, Integrated, SET amp! They have great synergy with the Bendix 6900 tubes that drive my Psvane WE845 tubes.
Excellent sounding tube recommended for phase splitter/driver in upper class instrument and HiFi tube amplifiers. For stereo application, tubes should be matched. We love them!