I had a Sonic Frontier SE line 2 which I replaced with a Bat VK 40 just as good in every respect except it had no tube noise a low levels like the Sonic Frontiers sometimes had , plus no tubes to replace.
Do a google research I know Stereophole reviewed the Bat VK 40 and compared it to a tube pre and the reviewer felt in a blind test he would pick the Bat as the tubed unit.
Do a google research I know Stereophole reviewed the Bat VK 40 and compared it to a tube pre and the reviewer felt in a blind test he would pick the Bat as the tubed unit.