The Electro-Harmonix 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 you Expect with any high-end audio amplifier. The 6550EH offers an improvement in power over even the most desirable vintage types including the Tung-Sol 6550 and Genelex KT-88. This extra headroom in a 6550EH equipped amp means you can finally realize the full dynamic range of your amplifier and the sweetest tone available.
The extra ruggedness of the 6550EH was engineered with for long-life. The nickel steel side rod mica supports ensure that the 6550EH will hold up in even the most punishing environment of high powered amps and still deliver the sweetest tone of any 6550 or KT-88. The 6550EH will greatly improve the performance of any amp using 6550’s but can also replace a KT-88 in any application.