Yellow Jacket Solid State Tube Rectifier<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Converts most audio amplifiers which use a vacuum tube rectifier 5AR4， 5U4 or 5Y3 to a solid state device </span></li><li><span class="a-list-item"> One year limited warranty on converter </span></li><li><span class="a-list-item"> NOTE: Because there is no warm up of a rectifier tube when using this solid state device， it is critical that a standby switch is used that will allow the power tube filaments to warm up before high voltage is applied. </span></li><li><span class="a-list-item"> Hand Built In USA </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51Kvyg3inQL.jpg" noproxy>