A week ago I received the order for the Psvane Horizon 6SL7 and 6SN7 for my Cayin CS-88A, purchased from the official PSVANE store; They have arrived perfectly protected so as not to suffer any damage, the shipment has been made at all times with a tracking number. At this moment they are still burning but I can say that the sound is excellent, I also have the Psvane EL34 PH installed as power tubes; and the first impression I have with the combination of all of them is that the bass is reinforced, they are more spacious, there is more detail in the sound and the voices are very velvety.... I am very satisfied with all of them, I previously had the Gold Lion KT88 installed and they sounded like transistor equipment to me, I have not yet tried these tubes again with the new ones from the Horizon 6SL7, 6SN7 series, but I will; They will surely transmit more power and space.... With the EL34 PH the first impressions are excellent, good space, warmth, softness but plenty of power, tight bass although a little more extended than with the Gold Lion, very marked mids with impressive voices and extended highs (with the combination of the Horizon series I have the impression that the highs have increased a little with respect to what was seen with the EL34 PH and the stock tubes)... My entire amplifier is now with tubes. PSVANE and when I hear it I can't stop smiling, the only unknown will be the durability,... we'll see what happens.....