Lesser known hybrids:
Ambience, A.R.T. (Advanced Ribbon Technology), BKS, Davidson and Soundline. There's more I'm forgetting right now. Some of these claim to work with low power tubes. (?)
Ambience, A.R.T. (Advanced Ribbon Technology), BKS, Davidson and Soundline. There's more I'm forgetting right now. Some of these claim to work with low power tubes. (?)