Electro-Harmonix 12AX7EH Preamp Vacuum Tube， Single<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Ultra low noise thanks to unique spiral filament which eliminates cathode-to-filament induced hum (common on amplifiers that use AC on the filaments) </span></li><li><span class="a-list-item"> Best all-around choice &amp; best value </span></li><li><span class="a-list-item"> Single tube </span></li><li><span class="a-list-item"> ECC83/7025 equivalent </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41vMAARHJkL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/21q3iFU3ShL.jpg" noproxy>