I've looked for a thread about this amp and didn't find one so I wanted to start one. This is a very cheap hybrid tube amp at around $50 but don't let that fool you because its a nice little amp. Compared to my Schiit Vali I think it adds a little more in SQ while being as powerful. At 1100mW (32ohm) it has plenty of power to push most headphones and sound really nice with HE-400i and Sony Z7. I was thinking the tubes wouldn't play much of a part in this amp but I was wrong, they add a good bit of warmth and color that sounds quite good. You get the power of a solid state amp with a nice bit of tube warmth at a very good price. I bought this amp with no real expectations, I just wanted to hear what a $50 hybrid amp sounds like. Now after using it for about a week I haven't touched my Vali once, just saying. Here's some specs, Output power: ≥ 1100mW (32 ohm) Adapter Headphone Impedance: 18-600 ohm Total harmonic distortion: <0.005% Frequency Response: 20-30KHz Size: 111 * 69 * 32 mm (L * W * H) , (height 73mm when add tube) Net Weight: 185g If anyone else has this amp or even another sub $100 hybrid let me know.