Warm Tips 1. The bias and gain of two 6E2 tubes are set well before shipping, please pay attention to the R/L channel markings on the tubes, don't insert them wrongly during installation. 2. 3.5mm headphone jack with priority, please make sure the headphone has been disconnected if you want RCA output. 3. Pluggable tube socket design, 6A2 is convenient to be replaced by 6K4, EF93, 6BA6, W727 etc. to enjoy tube sound of different styles. 4. T9 is a preamp not a power amplifier, needed to work with amplifiers or active speakers. Features Vintage vacuum tubes to provide double enjoyments: add magic eye 6E2 tubes to show the signal level dynamically, the color is pure with high brightness, also with switchable cold green and warm orange backlights, wonderful visual feast can be attained; default 6A2 tubes to improves everything associated with music, sounds warm and natural, full and mellow, amazing auditory carnival for your ears. T9 tube preamp with Phono and RCA inputs: Phono input, support both MM /MC cartridges with one button to switch, convert phono signal to line level signal, low-noise integrated circuits and high-quality components to ensure clear sound. Stereo L/R RCA input, amplify the low level audio signal from your phone, tablet, PC, MP3 etc., easier to drive amplifiers or active speakers and greatly improve their sound quality. 3.5mm headphone output and tone control: besides stereo RCA output also with independent 3.5 mm headphone amp circuit, easily to drive all 16-300Ω headphones. More delicate and smooth sound with rousing highs and deep lows can be enjoyed by adjusting the treble / bass knob, rejuvenating your audio system. Attractive looking and powerful design: all metal case and CNC aluminum panel with good shielding performance to avoid external interference. Solid and durable knurled knob, all I/O interfaces are gold-plated to ensure the tight and smooth transmission of the original audio signal to minimize the loss of the signal. How to Adjust the Bias and Gain of the 6E2 Tubes? 1. Power on T9 and do not input any source signal; 2. Adjust the BIAS to display the green light of the 6E2 tube at the bottom; 3. Then input the audio signal, and adjust the GAIN to display the 6E2 in the appropriate position and balance left and right. Parameters Audio input: Stereo RCA / Phono MM(MC) Audio output: Stereo RCA / 3.5mm Headphone Jack Headphone impedance range: 16-300Ω Headphone output power: 250mW@32Ω 100mW@64Ω 60mW@128Ω RCA IN: Input level: 0.775V RMS Output level: 1.5V RMS Input impedance: 100K ohm SNR: ≥106dB Frequency response: 20Hz-20KHz (±0.5dB) PHONO IN: Input level: 0.005V RMS (MM) / 0.0005V RMS (MC) Output level: 0.6V RMS Input impedance: 47K ohm (MM) / 330ohm (MC) SNR: ≥80dB Frequency response: Ref to RIAA ±2dB THD: ≤0.1% Tube: 2×6E2; 2×6A2 Treble&Bass: ±10dB Backlight Color adjustable: GREEN/ORANGE/OFF Working voltage: DC 12V(≥1A) Dimensions (W*D*H): 154*87*47mm / 6.06*3.43*1.85in Package dimensions(W*D*H): 210*190*100mm / 8.27*7.48*3.94in Net weight: 600g/1.32lb Package weight: 1.0kg/2.20lb Packing List 1*T9 Preamp 2*6E2 Tube 2*6A2 Tube 1*DC12V Power Supply 1*Manual

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