Shuguang / Psvane 300B-Z/2 Matched Pair Black TreasureShuguang Black Treasure 300B-Z PREMUIM GRADE A - Factory Matched Pairget shipped as factory matched pair The Black Treasure 300B-Z got improved in structure for better dependability and safe shipping:Gold coated pins to enhance connection over long term High Polymer Compound Carbon (HPCC) coating is for the first time used on vacuum tube production. Compared to traditional carbon spray technology, HPCC coating will allow greater concentration of electrons, enhance and maintain stability of the electron flow, maximize secondary electron emission surpression from the glass enclosure, in turn reduce effects of electron swirl which generates internal noises from the vacuum tube itself All parts are selected to the highest grade plus only highly experienced workers to assemble Suggested burn-in time is 80-150 hours selected for PREMIUM GRADE A quality and matched at factory (the lower budget grade B = regular version is not offered nor sold by TAD)

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