I feel like a complete fool, but I recently plugged each mono block into its own dedicated outlet, and man, what a difference! Now tetrode and triode sound a lot more alike, and I actually prefer tetrode for 80-90% of my listening.
Tetrode sounds perhaps "grittier," but more real! I certainly agree with Zaikesman that with tetrode there is more extension, and that the frequency spectrum is flatter. This is important to me, as I can lean back, listen, and there is nothing missing (highs, mid-range, lows, everything is there, and nothing jumps at you - - just like in the symphony hall). The soundstage is incredibly linear and extends well beyond the speakers to the left and right (but is also deep).
Conversely, with triode, I feel that the midrange is accentuated. Vocals are clearer with triode, yes, but over the long haul, it's not as involving (it get's a bit "glassy" and the soundstage is smaller than with tetrode. Actually, the soundstage with triode stays beween the speakers, and it's more "curved."
My experience is that the db difference for equal loudness is maybe 1.2 to 1.5 (i.e., triode needs to be set at 1.2 to 1.5 db higher than tetrode, which is also easy to do with my preamp (Levinson 380s).
I agree that it would be nice to keep tetrode the way it is, but also have triode's better harmonic structure and inner detail. Why can't VTL do that? Hopefully, they will at some point in time.
Tetrode sounds perhaps "grittier," but more real! I certainly agree with Zaikesman that with tetrode there is more extension, and that the frequency spectrum is flatter. This is important to me, as I can lean back, listen, and there is nothing missing (highs, mid-range, lows, everything is there, and nothing jumps at you - - just like in the symphony hall). The soundstage is incredibly linear and extends well beyond the speakers to the left and right (but is also deep).
Conversely, with triode, I feel that the midrange is accentuated. Vocals are clearer with triode, yes, but over the long haul, it's not as involving (it get's a bit "glassy" and the soundstage is smaller than with tetrode. Actually, the soundstage with triode stays beween the speakers, and it's more "curved."
My experience is that the db difference for equal loudness is maybe 1.2 to 1.5 (i.e., triode needs to be set at 1.2 to 1.5 db higher than tetrode, which is also easy to do with my preamp (Levinson 380s).
I agree that it would be nice to keep tetrode the way it is, but also have triode's better harmonic structure and inner detail. Why can't VTL do that? Hopefully, they will at some point in time.