I’ve had great experience with metal base gz34’s. I’ve used one in a Bob Latino’s sl70 power amp, Modwright pre and currently using one in my Cary SLP05. In all three cases the metal base GZ34 made the most significant positive improvement to SQ I’ve experienced.
What is the best sounding GZ34 / 5AR4 rectifier tube you've ever heard?
Looking for experienced opinions. Is there a holy grail?
Thanks!