Originally Posted by markmaxx
Have you tried the 12av7 yet? I think with limited listening It is the most slam-in tube in my rig so far! (HD650/K340) It offers a great clean micro detailed sound, a ton of slam when the music asks for it and a great sence of every thing being in the right place:.. "Equilization wise".
I give it a must have in everyones tube collection with a MPX3.
I did try an RCA 12av7 with the K701's and it sounded a little bit lacking in the bottom end to me, like it had no depth in the lower ranges. But I only had one, so it could be that particular tube. Also, the 12av7 might be just right with the HD650 (I haven't tried this yet, but it's on my list of the 500 various combinations I need to try).
Anyway, with the K701's, I like the sound of the Tung Sol 12au7, which has less gain, bettter than the 12av7. But again, I'm not sure how much of this judgment is brand-dependent -- or headphones dependent.