Shuguang Treasure KT88-Z Vacuum Tubes Matched Pair Replace KT88 CV5220 6550

Shuguang Treasure KT88-Z Vacuum Tubes Matched Pair Replace KT88 CV5220 6550 Item Details Features: Up for sale will be one matched pair ( 2pcs) of ShuGuang Treasure vacuum tubes KT88-Z (Substitution of 6550), packed in environmental protection box as picture shown, product of SHUGUANG Electron Group. CO. LTD. Made in China. The”Shuguang Treasure” as a result of Shuguang’s 50-year of expertise in vacuum valve design and production. 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 suppressions” from the glass enclosure, in turn reduce effects of electron swirl which generates internal noises from the vacuum tube itself. Improved vacuuming technology during production process to clear signal background . Key assembling process is manually completed by a small number of senior technicians with 30+ years of experience. 60 extra parts selection and matching processes are adopted to ensure premium quality tubes, compared to the Shuguang generic clear glass tubes. Premium Grade matched right out of factory to serve outside of China market . Suggested burn-in time 150-300 hours. Most changes happen in the first 150 hours. Package Included: 2 pcs × “Shuguang Treasure” series KT88-Z Vacuum Tube(Matched pair) If you want to buy quad matched, you can direct buy 2 pairs and leave a massage to us(Please quad matched). Payment Refund & Warranty Delivery details Delivery time Contact us Payment We accept payment via Paypal only. Please contact us if you have any questions. Refund & Warranty * 30 Days for exchange or money back from the date you get the item. * If you are not satisfied with the product you received, please don’t use it, and return to us within 30 days. * If you find the package is broken, please refuse to sign, then it will be returned to us. * One year warranty, if there quality problems caused by by non-artificial reason, the company replacement, a one year warranty. Delivery details * Orders processed within 24-48 hours of payment verification ( from Monday to Friday, excpet holidays) * All packages will be shipped out in Securely packaged boxes to make sure it is in good condition. * If you have not received your shipment within 30 days from payment, please contact us. We will track the shipment and get back to you as soon as possible with a reply. Our goal is customer satisfaction! Delivery time * For USA buyer: 7-15 Working Days, free shipping via SpeedPAK ; 3-5 Working Days via Expedited Int’l Shipping. (Extra Shipping Cost 20USD ) * For Other Countries buyer: 15-35 Working Days (depends on custom), free shipping Via SpeedPAK with tracking number. 3-7 Working Days via Expedited Int’l Shipping. (Extra Shipping Cost 20USD) Contact us * We welcome all e-mails, and happily respond to every e-mail we receive, usuallywithin 24 hours. For fastest reply, please contact us through Ebay messages. * Your positive feedback is important to us.positive feedback is important to us. * We have an excellent team to support our customer service. Please feel free to contact us if you have any questions.