The 6550EH is the finest current production tube for any amp using 6550s or KT88s. With 42 watts of plate dissipation in tetrode operation and 44 watts in triode, the 6550EH offers an improvement in power over even some of the most desirable vintage types. This extra headroom in a 6550EH equipped amp means players can finally realize the full dynamic range of their instrument and the sweetest tone available.
The 6550EH will greatly improve the performance of any amp using 6550s but can also replace the KT88 in any application. Bottom-line: a new pair of Russian made 6550EH power tubes is a great sounding and affordable choice for your Leslie amp.