In your search for the perfect tube for the EE Dac, you should consider no tube at all... or at least try listening for a bit without one.
Many here seem to derive significant benefit from a swap to more capable opamps. LME49990's have worked out particularly well for me, but others have indicated their prefs for a variety different, but compelling, combos.
Losing the tube spontaneously ended my arduous search, along with the ever growing hole in my pocket, and led to a much cleaner, clearer and more satisfying sound.
Many here seem to derive significant benefit from a swap to more capable opamps. LME49990's have worked out particularly well for me, but others have indicated their prefs for a variety different, but compelling, combos.
Losing the tube spontaneously ended my arduous search, along with the ever growing hole in my pocket, and led to a much cleaner, clearer and more satisfying sound.