Nobsound NS-08E Vacuum Tube Integrated Amplifier Mini Audio HiFi Stereo Headphone Amp<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> This is Douk Audio's own brand， Nobsound. Nobsound features a low price coupled with high performance in a small， simple package delivering high fidelity， specially designed to provide the audiophile with the performance they deserve. </span></li><li><span class="a-list-item"> This unit can easily power high-performance headphones including the HD 580， HD 600， HD 650， K 701， K 702， Q 701， and many more. 24~600Ω headphones would be recommended and armature earphones are not suitable. </span></li><li><span class="a-list-item"> Package includes: headphone amplifier， 6J9 vacuum tubes (x2)， and power supply. </span></li><li><span class="a-list-item"> Input and output audio jacks are both 3.5 mm. Please note， package does not include audio cables. </span></li><li><span class="a-list-item"> Replacement vacuum tubes include: E180F， 6ж9П， EF861， and 6688. For our latest tube headphone amplifier， please search B01I19SBAW on Amazon. It is the smallest headphone amplifier in the world， yet very powerful. </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41llpyTU%2BIL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51u01L3EdnL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51PtveG8peL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41-rqSUQ9gL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51WNYmorqPL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51mKy9u1yBL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41ovtX7AbZL.jpg" noproxy>