This is a fantastic sounding headphone amplifier and dac. I’ve used it with Sennheiser HD-650 and HiFi Man planar headphones as my go to choices. The amplifier has a very smooth and musical quality with ample power to drive power hungry headphones like the Sennheiser. There is less than 100 hours of use on the tubes plus the 2 additional sets provided fun tube rolling experience. This Little Dot MK III OTL Vacuum Tube headphone Amplifier with JDS Labs ODAC is perfect for those who want to enhance their audio experience. With two channels, one input and two outputs, this black and silver amplifier is ideal for any music lover. The stereo L/R RCA audio inputs and outputs, along with a headphone jack, ensure that you can use this amplifier with a variety of devices. This tube amplifier is made by Little Dot and is a model MK III. It is an amplifier class A product and was manufactured in China. The product is ideal for people who are looking for a high-quality audio experience without any compromise. Included in auction - JDS Labs Objective 2 ODAC for use with computer and digital sources. - 2 additional sets of Russian preamp tubes for personalized tube rolling to tailor the sound to your personal preference. This amp is in excellent condition and has less than 100 hours of use on it. - All cables and Odac power supply included.