Groove Tubes GT-6L6-R Medium Quartet Amplifier Tube<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Warm overdrive and soft distortion character </span></li><li><span class="a-list-item"> Very strong， smooth， and linear </span></li><li><span class="a-list-item"> Originally invented by RCA in 1936， the 6l6 Tube has been used extensively in Fender amplifiers since the 1940's </span></li><li><span class="a-list-item"> Hand Tested &amp; Matched in Quartets (a set of 4 tubes) </span></li><li><span class="a-list-item"> Limited Warranty Included </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41ak%2BIcQYzL.jpg" noproxy>