The Freya+ is as good as it gets at even twice its price. Unfortunately it comes with some cheap JJ tubes. You have to do some tube rolling to unlock its true potential.I went with ken rad by-231tubes and they took the Freya up to a whole new level! This of course brings up the overall cost, but is worth every penny! Keep in mind that you only have to change the tubes on the right side. The ones on the left are for the cathode follower and do not effect the sound. The Sylvania 6sn7GTA tubes are also a excellent choice at a lower price point. Keep in mind that the GTA is pre 1955 and are a better choice then the GTB. One other suggestion is to use tube buffers because the Freya’s case rings like a bell and the tubes pick up the vibration. Brad