Mullard CV4004 / 12AX7， Matched Quad<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Matched Quad </span></li><li><span class="a-list-item"> Matched for both gain and conductance </span></li><li><span class="a-list-item"> Short plate， allowing for reduced microphonics (great for combo amps) </span></li><li><span class="a-list-item"> High gain and low noise tube </span></li><li><span class="a-list-item"> Great for use in Marshall style amps </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51tFxQ7LcUL.jpg" noproxy>