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"Psvane 300B-T/2 Black Bottle (Matched Pair)\r\n\r\nThe Psvane T-series black bottle tubes are a further development over the highly sought after Shuguang Treasure Z-series, which was originally first launched by Grant Fidelity in Jan 2009 in North America as Shuguang\u2019s first take on high end vacuum tubes.\r\n\r\nThe elite team of engineers who contributed to the Treasure Z-series have done further fine tuning of the Z-series in the past few years. The further development has created a new series called Psvane T-series which including 4 black bottle models for the time being \u2013 KT88, 300B, 6CA7 and 6SN7 (CV181). The Psvane T-series is considered as MKII version of the Treasure Z-series, but the brand of Psvane is under different ownership backed by venture capital in other countries and controlled by different parties other than Shuguang tube factory itself.\r\n\r\nThe Psvane 300B-T tubes are direct replacement to standard 300B tubes of all make.\r\n\r\nPsvane 300B-T has exactly the same electronic specification as the Treasure 300B-Z. The tube base has been upgraded to gold plated instead of white ceramic. All pins are gold coated as well.\r\n\r\nSonically the T-series is considered modern refined while the Treasure Z-series were originally developed to after the New Old Stock tube sound. Both are great sounding tubes. You will enjoy the \u2018black bottle\u2019 collection immensley.\r\n\r\nDue to the materials selected for constructing the black bottle tubes, the Psvane T-series will require similar 150-300 hours burn-in time to sound to its best."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.hotroxuk.com/psvane-300b-t-2-black-bottle-matched-pair.html>