300B-T MKII Psvane matched pair premium audiophile output tubes. These have a special gray coating on the glass to increase internal uniformity of electron flow, eliminate photon interference which enhances overall sound quality from lower distortion. Also gold plated pins for the lowest contact resistance and a hardened bakelite base for vibration reduction and heat resistance. These are a significant upgrade to the Shuguang "Z" series tubes with the black glass which were extremely well received by the audiophile community and were part of their Treasure Series of tubes made in several popular part numbers.
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