I have to concurr with SteveM.I have tried TJ meshplate PX4s,EH 300Bs and TJ meshplate 300Bs in my Cabernet.The TJ 300Bs are vastly better.They have utterly amazing treble and a lovely double cream sort of richness without any loss in vibrancy.In a way they are the epitome of the 300B sound.
The EH 300Bs sound dull,dry and compressed by comparison.
JT