The Shuguang Treasure series 6CA7-Z tube is a significant upgrade to the regular EL34/6CA7 both sonically and aesthetically! The 6CA7-Z has gold grid wires and a black glass bottle reduce photon interference This High Polymer Carbon Compound glass coating reduces electron resonance/reflection.Super Alloy technology is also used in their anode material. This material has a very uniform crystal structure allowing much greater electron transfer uniformity and efficiency. Smoother, more detailed nuanced and life-like sound results from this high-tech material.Treasure series has superior parts selection quality control, a harder vacuum, and additional burn-in time and testing resulting in an overall superior sound, reliability and longevity. Buy from a US seller who backs the warranty here in the USA.
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