<ul><li>Versatile Audio Input/Output: Supports coaxial, optical, and RCA inputs, with RCA, 3.5mm, and 4.4mm headphone outputs. Ideal for phones, tablets, TVs, and CD players.</li><li>High-Fidelity Sound & Tone Control: Tube design softens harsh digital sound, with treble and bass knobs to adjust highs and lows to your liking.</li><li>Advanced Components: ESS9018 chip for 24bit/192KHz audio, TPA6120A2 amp IC for strong output, and NE5532 op-amps for improved performance and soundstage.</li><li>Compact & Stylish Design: CNC-machined aluminum chassis with vintage tube glow, easy input selection, and great sound in a small footprint.</li><li>User-Friendly & Customizable: Dual headphone outputs with auto RCA disconnect; pluggable tube socket for upgrades to 6*9N or EF861 tubes.</li></ul> Warm Tips 1. Dual headphone jack output is prior and can output at the same time, stereo RCA output will auto disconnected when headphone is inserted. 2. Pluggable tube socket design, 6J9 can be upgraded to 6*9N / EF861 tubes. Parameters Audio input: Optical / Coaxial / Stereo RCA Audio output: Stereo RCA / 3.5mm headphone jack / 4.4mm balanced headphone jack Max sampling rate supported by coaxial / optical: PCM 192KHz/24bit Max output power of headphone jack: 1200mW/32 (3.5mm jack) 260mW/32 (4.4mm jack) Matched headphone impedance range: 16-600 Frequency response: 20Hz-20kHz(0.5dB) THD: 0.03% SNR: 106dB RCA output level: 2VRMS Treble & Bass range: 6dB Working voltage: DC 12V Dimensions(W*D*H): 132*132*33mm / 5.20*5.20*1.30in Package dimensions(W*D*H): 310*240*80mm / 12.20*9.45*3.15in Net weight: 542g / 1.19lb Package weight: 900g / 1.98lb Packing List 1*TUBE-T7 Preamp 2*6J9 Tube 1*DC 12V Power Adapter 1*Optical Cable

Mini Tube DAC Preamp with Coaxial/Optical to RCA Conversion, Balanced Headphone Amp, 24Bit/192KHz