HiFiMAN EF2 USB Headphone Amplifier

I am upgrading to a triode based headphone amp, so I am letting this one go. The HiFiMan EF2 USB headphone amplifier has either USB or RCA connectivity on the back, with 1/4" headphone connection on the front. Power is supplied by a meaty wallwart, and it uses a pair of 6AK5/6J1 tubes for the output power. The built-in DAC does not require any software installation on your computer, so it is a plug and play device.

I have upgraded it with a pair of NOS Hyton 6AK5 tubes, and it will also come with the original Chinese 6J1 tubes and a spare NOS GE 6AK5 tube. I have also applied Dynamat to the inside of the chassis to help eliminate any exterior noise.

It is a pretty good sounding little amp, and for me, headphones are one of the best applications of tubes. The amp, as well as all the tubes, have been burned in, and it sounds very musical through both the K702s and ATH-AD700 cans.

Imput Impedence: 47k
Output Impedence: 32-300 Ohm
Output at 32 Ohm: 3 v, 320 mw
Output at 150 Ohm: 6.2 v, 256
Freqency: 20-20khz +/- 0.2db
S/N: 95db
DAC Chip: Burr-Brown PCM2702
Tube: China 6J1 * 2 pcs
Input Voltage: 16 v to 18 v; 500 mA
Power Supply: 110 v wall transformer
Size: 14cm*8.5cm* 4.5cm or 5.6"* 3.4" * 1.8"

$120 shipped CONUS