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eBay Brand New In Box Tested Electro-Harmonix KT88 Vacuum Tube – Single We only sell factory fresh tubes and NOT seconds as we are an authorized dealer for New Sensor (EHX) and JJ The Electro-Harmonix KT88 is different than the Electro-Harmonix 6550. While the are both great tubes, the KT88 version is modeled after the British sound and has a different internal plate structure. Just like the GEC KT88 this one has a rounded and more bass heavy sound than the 6550. The KT88 and 6550 are electrically equivalent, they just have slightly different sounds. The new KT88EH tube is here. In this KT88 tube, a new geometry is utilized to reduce odd order harmonics for a sweet top end while the peak power is extended to improve low frequency response. A new glass formula body ensures long life and improved reliability. The perfect choice when the authentic sound is needed. Testing and/or Matching We test and/or match our tubes by Gm & Plate Current using a state of the art digital Maxi-Matcher tube tester. The Maxi-Matcher simulates a real circuit and tests tubes in real-world conditions. We also check our tubes for other issues like shorts on calibrated and vintage tube testers. We match our tubes +/- 5% with an overall tolerance of 10%. While we do screen for noise and microphonics, even the best tube testers are quite bad at finding these faults. The only real test is with your ears. We guarantee that our tubes will be free of noise or microphonics but please be aware that there isn’t a whole lot we can do to ensure your tube won’t be. To combat this issue, we are quite liberal in accepting returns for these reasons. Shipping ** INTERNATIONAL shipments typically take 3-6 weeks by our standard USPS First Class Mail but often take up to 3 months for delivery. eBay estimates are NEVER correct for International ** All orders are processed & shipped within 1 business day Since all of our items ship for free, we cannot combine shipments and will not refund you retroactively Domestic Orders USPS First Class Mail: 2-7 business days, tracking USPS Priority Mail: 1-3 Business Days, tracking International Orders USPS First Class Mail International: 3-6 weeks typically but up to 3 MONTHS, limited to no tracking USPS Priority Mail International: 1-2 weeks, full tracking Guarantee & Returns We guarantee our tubes for 90 days upon receipt. If anything goes wrong in that time, we will replace tube once returned to us. We also pay the return shipping or will send you a prepaid shipping label so you will not be out anything. We accept returns if a tube arrives faulty or becomes faulty within the warranty period. Noise and/or microphonic issues are covered. We reserve the right to deny returns for buyer’s remorse including the buyer’s opinion on “tone”.

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