Up for sale is a superior DIY project valve audio power amplifier. As seen in the pictures, it has very light signs of use. She has been solely designed around the venerable KT66 bottle valve. In this case i have supplied a brand new set of Shuguang KT66Z Black Treasure valves. They are spectacular........open power, zero fatigue, simply breathtaking sound stage. Built with a superb set of American Edcor GSXE output transformers and using only premium components. If this will be your first or other one, it will definitely impress . The KT66-Z tube's construction features gold grid wires and a new internally coated black glass bottle. This unique HPCC coating is known as High Polymer Carbon Compound glass coating and is unique for its ability to reduce stray electron emission that can otherwise reflect off the glass. Shuguang also uses their new "Super Alloy" technology. Originally applied to aviation, aerospace, and military applications, this technology has been successfully used by Shuguang to accomplish directional solidification and single crystallization. This greatly improves the ability of electron emission and electron current stability. This new Shuguang Treasure series required additional parts selection quality control processes, improved vacuum techniques and additional burn-in time and testing. This Shuguang Treasure KT66-Z tube is their premium export grade and purchased direct from Shuguang in China. Please know that a video of her capabilities can be sent on finalization but electronics are not guaranteed and it will be shipped with the utmost care to protect her with our custom double box system