Added to that is when I call some reputable dealers they say they have not seen a genuine early cca tube in years and that most everything out there is a fake.That must be Andy Bowman, yes? Gotta love him. He told me the same thing four years ago. Since then, I have purchased several pairs of CCa tubes from various sources...none of them tube dealers. Every tube has been genuine.
Gammajo (System | Threads | Answers)
Siemens started to box their tubes in Rohre boxes in the mid 70s. The quality started to decline somewhat around that time, especially regarding microphonics. That's why Siemens & Halske boxed tubes are preferable. Better and more consistent quality.