This product uses the voltage: 220V
Please note the voltage adaptation

An affordable light luxury HiFi earphones.

The ear amplifier for pure Class A Hi-Fi ear amplifier, with the Changsha Shuguang electronic bile tube 12AU7, can be replaced by ECC82, 6189, the package is fully compatible, different tube tone will have different performance.

The PCB is now upgraded to a sunken gold plate, while the audio capacitors are upgraded to Japanese Nichicon special audiophile capacitors, power supply filter capacitors are also upgraded to Japanese chemical power supply special capacitors, connectors are also upgraded to branded high-end products, power supply is a major manufacturer of customized special models.

Design concept.
Put the switch, volume knob, audio output on the front, so that it is more convenient when switching, adjusting the sound and unplugging the connector. The power connector and audio input connector are placed in the back, because these two are not often unplugged, if the earphone is used for computer use, the computer will not be connected to the basic after a long time to unplug. In order to ensure the performance of the music at the same time pay attention to the appearance of the design. Each one is carefully tuned to ensure performance to fully release the potential of the headphones.

The specific parameters are
Operating voltage: DC24V.
Input sensitivity: 100mV.
Input impedance: 100k ohms.
Output impedance: 20~600 ohms.
Gain: 30dB.
Frequency response: 10Hz-50KHz.
Input interface: 3.5mm audio interface.
Output interface: 6.35mm audio interface (with 6.35 to 3.5mm adapter).
Dimensions: length 100mm (counting potentiometer knob) width 82mm height 75mm (counting electronic tubes).

Features.
Circuit design using a mature, stable and reliable pure Class A program, circuit wiring meticulous and careful. The sound is delicate and warm, smooth and burr-free, with strong bass and lush treble. All resistors are metal film resistors, using high-frequency low resistance high-temperature capacitors, using original imported driver tubes, with Japan ALPS potentiometer, imported brand button switch, pure manual welding debugging. Accessories are not ambiguous, Akihabara genuine connection cable, custom 24 V / 1.5 A high-power audio power supply.

Attention.
The biggest advantage of pure class A amplifier is good music performance, but it also has a major disadvantage, that is, serious heat, because the characteristics of class A amplifier is the output stage of the two sets of output tubes are always in a conductive state, there has been current flow, so that the electrical energy is converted into heat. The ear amplifier has used a large heat sink to dissipate heat, it will be very hot, but completely within the temperature range, close the device when not in use.

Product list.
1, one ear amplifier body.
2, Changsha Shuguang Electronics 12AU7 electronic tube a.
3, Akihabara genuine 3.5mm audio connection cable a.
4, gold-plated 6.5mm to 3.5mm audio plug a.
5, DC24V/1.5A audio special power supply a.