The Sophia Carbon plates sound very good in the Vac ren's....do not use a mesh plate tube. The Vac's require a well made tube and even the Sophia can pop if not up to spec...but out of 16...had to replace a pair...under warranty. These carbon plates are nuetral and have a very liquid midrange...plus the highs are beautifully extended and the bass is full and solid...a great sound especially coupled with the Brimar CV1988....good luck.
300B Tubes
Anyone try the western electric serial numbered current manufactured stock (not OEM). I've got a VAC renaissance signature seventy/70 dual monophonic triode power amplifier. How do they compare with other 300B's and especially the KR 300B? Currently my amp is running the shuguang 300B tubes. How much improvement do you think I can get with the WE's or the KR's?