@luisma31 Great, thanks so much for the details. Seems to be a bit of a consensus that people prefer the 6sn7 circuit in the Suprateks.
I have SS amps (First Watt f4 monoblocks) that provide only current gain and have very little sound of their own as well (and have had both m60s and 300b SET monos in the system). Currently have a 6sn7 pre and have an eml-20AM based dht on the way. I love the current sound, but am also looking forward to comparing the different preamp typologies. I'm cheering for the dht because it's a custom build and resale will be difficult, but as always, the proof is in listening and whatever sounds best wins. As you accurately state... you only learn by hearing the gear in your system.
I have SS amps (First Watt f4 monoblocks) that provide only current gain and have very little sound of their own as well (and have had both m60s and 300b SET monos in the system). Currently have a 6sn7 pre and have an eml-20AM based dht on the way. I love the current sound, but am also looking forward to comparing the different preamp typologies. I'm cheering for the dht because it's a custom build and resale will be difficult, but as always, the proof is in listening and whatever sounds best wins. As you accurately state... you only learn by hearing the gear in your system.