For more detail, neutral midrange, vintage 6SN7 Sylvania GT work okay
Having tried several different pairs of interconnects...each provided different results as well.
Warmth to me is more "meat on the bones" in the midrange. It’s not the low-end.
In my LTA Microzotl MZ3 I have (2) 6SN7 Sylvania GT and or 6SN7 Sylvania W with both tubes being ’metal base’ are quite special with the Micrzotl circuit. And in the 12AT7 position I have (2) Telefunken ECC801S /12AT7WA’s. and the synergy is again, fantastic.
My interconnects are 聖Hijiri HCI-R10 and the synergy is outstanding with this preamp and tubes. The LTA Microzotl MZ3 with these additions provide open, detailed, airy, holographic, quiet background and a wide sound stage with an uncanny overall balance in the sound it puts out. The ’openness’ I hear with this combination is what I’d define as exactly what @audiojan described above as ’meat on the bones’ midrange.
Now there’s one more thing I have to mention. I snagged @grannyring’s old Clayton Audio modified S-40 amplifier that came up for sale some months ago and it was a perfect synergistic match with my gear. I couldn’t be more happier with the results.
So @grannyring, if you read this, Thank you very much for what you do and share here on audiogon.