Consider Groove Tube EL34Ms made by Mullard; very dynamic and spatial in my Cary V12R. Another key with this amp is the use of BZ7 input tubes. -Lars-
Groove Tubes EL34LS vs SED
i have a amp air tight ATM-3 to be precise that currently uses Siemens EL34. I want a bit more dynamics especially at the bass. Has anyone tried these? The Siemens seem at the end of their life, although they test fine in a tube tester, the bias cant be adjusted sufficiently high. Since I got this amp recently (used) I dont know if the lack of bottom end is due to old tubes, or just the amp itself.Advice appreciated THX