I recommend you to try out Schitt Freya+ pre in front of Luxman amp.
It will give warmth to your speaker.
Schitt give 15 day’s return.
Stock 6sn7 tube does sound decent, but if you like the sound of Freya then you may try some Nos tubes(Sylvania GTB or RCA gray bottle around 100$ pair or Kenrad vt 231 at 200$ pair)
Kenrad vt231 sounds sweet with excellent bass.
You may refer to the following thread on general reputation of 6sn7 tubes.
6SN7 VT
The Reference 6SN7 Thread
It will give warmth to your speaker.
Schitt give 15 day’s return.
Stock 6sn7 tube does sound decent, but if you like the sound of Freya then you may try some Nos tubes(Sylvania GTB or RCA gray bottle around 100$ pair or Kenrad vt 231 at 200$ pair)
Kenrad vt231 sounds sweet with excellent bass.
You may refer to the following thread on general reputation of 6sn7 tubes.
6SN7 VT
The Reference 6SN7 Thread