My black plates have been burning some 600 hours with no weakening noticeable. They do have a reputation for earlier burn out than most. I have one spare pair, and a private collection where I can score one more pair. I'll be trying some cheaper and more plentiful substitutes soon. I'll let you all know how they turn out.
Distortion has already announced he likes his EH 12AX7 tubes better, because of his spirited upper treble. Svetlana isn't all that bad. Mullard works on some systems. JAN Phillips is an all rounder. None of these, I would put into my first system.
Distortion has already announced he likes his EH 12AX7 tubes better, because of his spirited upper treble. Svetlana isn't all that bad. Mullard works on some systems. JAN Phillips is an all rounder. None of these, I would put into my first system.