Brand New Electro-Harmonix 6550 Ceramic Vacuum Tubes - Matched Quad. We only sell factory fresh tubes and NOT seconds as we are an authorized dealer for New Sensor (EHX) and JJ. The 6550EH is the finest current production tube for any amp using 6550 or KT88. The 6550EH offers the maximum power of any 6550 with the linearity guitar and bass players want. With 42 watts of plate dissipation in tetrode operation and 44 watts in triode, the 6550EH offers an improvement in power over even the most desirable vintage types including the Tung-Sol 6550 and Genelex KT88.This extra headroom in a 6550EH equipped amp means bass players can finally realize the full dynamic range of the instrument and the sweetest tone available. The extra ruggedness of the 6550EH was engineered with the punishing abuse of guitar amps in mind.
The nickel steel side rod mica supports ensure that the 6550EH will hold up in even the most punishing environment of high powered bass amps like the Ampeg SVT and combos where the tube is only inches from the speaker and still deliver the sweetest tone of any 6550 or KT88. The 6550EH will greatly improve the performance of any amp. 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. We guarantee our tubes for 90 days upon receipt. Noise and/or microphonic issues are covered. The item "Brand New Current Matched Quad (4) Electro-Harmonix 6550 Ceramic Vacuum Tubes" is in sale since Thursday, March 22, 2018. This item is in the category "Musical Instruments & Gear\Guitars & Basses\Parts & Accessories\Amplifier Parts". The seller is "onlyglass" and is located in Easthampton, Massachusetts. This item can be shipped worldwide.