Electro-Harmonix KT88 Vacuum Tube， Matched Pair<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> High power kinkless-tetrode for use in amplifiers such as the Marshall Major. </span></li><li><span class="a-list-item"> This tube is a favorite of audiophiles. Can be used in place of 6550 for a more "round" bass signature. </span></li><li><span class="a-list-item"> Manufactured In Russia </span></li><li><span class="a-list-item"> Matched Pair </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51ySZvtAeGL.jpg" noproxy>