RACOON SG300 24Bit/96KHz USB Decoder DAC tube amp Black with PSVANE 12AT7-T tubes, 12AT7-T with 12AT7/ECC81/6201 / GT-12AT7/6C22D/12AZ7 tube swap, instead of using direct replacement; DAC decoder chip uses CIRRUS LOGIC company's top digital / analog converter chip CS4398 chip, it is up to 120dB signal to noise ratio and dynamic range parameters, perfectly supports up 24Bit/192KHz digital signal D / A demodulation; amp power amplifier chip: TI TPA6120A2 headphone impedance is range from 8-1000, the output power peak - peak range from 2.7W-100mW, strong thrust, easy drive all Headphones The amp can be done using the powerful preamp, can be accessed 8 ohm / 10W amplifier using the speaker to do