I replaced the PSVane KT88-TII Mark II tubes with the original Cayin KT88 and it was immediately noticeable how the dynamics, depth, delivery, clean highs, dynamic bass, noticeable mids changed, the sound suddenly got a completely different dimension, the space also changed, beautiful 3D details, which I had rarely heard before. The tubes arrived beautifully packed in boxes with foam, against damage, excellently packaged. So we'll see when they burn out after about 250 hours, I assume the sound will get even better and it will be like a symphony of tone, which I will enjoy forever :) ... Thanks to Audiophonics for the fast delivery to the Czech Republic.