I have two SF Line 2s (no SE)
The 6h23n's are great tubes to tighten up an overly "tubey" sound (such as in my all tube system). To get more of the "tubey" sound (in my solid state system)I go with A-frame Amperex in the v1/Lv1 (first pair). This is, by far the important pair in this preamp for sound. I don't actually find much difference in tube rolling v2/Lv2 or v3/Lv3
The 6h23n's are great tubes to tighten up an overly "tubey" sound (such as in my all tube system). To get more of the "tubey" sound (in my solid state system)I go with A-frame Amperex in the v1/Lv1 (first pair). This is, by far the important pair in this preamp for sound. I don't actually find much difference in tube rolling v2/Lv2 or v3/Lv3