Mullard EL84， Matched Quad (4 tubes)<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Copy of the original. Black plates， carbonized screens， and gold plated grids. </span></li><li><span class="a-list-item"> EL84 Vacuum Tube </span></li><li><span class="a-list-item"> Current Production </span></li><li><span class="a-list-item"> A mainstay of affordable quality hi-fi amplifiers </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/513Hfnns3VL.jpg" noproxy>