Fully upgrade version. Now P1 is equipped with GE5654 / JAN5654 vacuum tubes and can get greatly enhancement in sound quality. Hi-Fi Vacuum Tube Preamp & Headphone Amp HiFi tube Preamp, USB DAC & headphone ampGE5654 / JAN5654 vacuum tubesWarm retro tube soundCan be replaced by 6Ж1, 6J1, 6J1P, 6J1P-EB, 6Zh1P-EV, 6AK5, 6AK5W, EF95 Bluetooth 5.0 & APTX-HD Adopt QCC3034 Bluetooth chipSupport Bluetooth 5.0 to ensure strong signal strength and stabilitySupport APTX-HD lossless transmission to ensure high sound quality USB & RCA Multiple Inputs Besides Bluetooth input, it also supports USB & RCA inputsCompatible with various devices like iPod, Phone, MP3, TV, Blu-ray players, Echo Dot, CD players, computer etcPC-USB supports 24bit 192KHz and is compatible with Windows/Mac/Linux system Treble / Bass Control & Bypass Function Support treble and bass controlBypas function (tone control can be turned off to achieve purer music experience)Bluetooth / USB / RCA input selectorTube LED can be turned off or switched to another color Headphone & RCA Outputs Support headphone (3.5mm) AUX & RCA outputsAdopt NE5532 op amp+classic 47 headphone ampHeadphone output is 160mW @32Ω and is suitable for 32~300Ω headphones and headsets Upgrade DC Connector Equipped with high quality 12V power supplyUpgrade DC connector without spark issue. Safe to use. Packing List 1*P1 Preamp 2*GE5654 Tube 1*Power Supply 1*USB Cable 1*Bluetooth Antenna 1*Manual Douk Audio P1 Parameters Chip Architecture: CM6642+QCC3034+NE5532+classic 47PC-USB Input Sampling Frequency: 192K/24BitTHD: 0.01% , SNR: 103dBPC-USB System supported: XP/W7/W8/W10/MAC/LinuxBluetooth VER: 5.0Headphone matching impedance: 32-300ΩHeadphone Max power output: 160mW 32Ω loadBass & Treble Range: ±6dBRCA output level: 2.3VFrequency Range: 20Hz-20kHz(±3dB) Product Weight: 0.47kg Product Dimension: 180*118*36mm Package Dimension: 240*210*60mm Panel Introduction Douk Audio P1 Douk Audio P2 Douk Audio T4 PLUS Nobsound T3 Douk Audio T3 PRO Douk Audio H7 PRO Add To Basket Buying Options Add To Basket Add To Basket Add To Basket Add To Basket Customer Reviews 4.2 out of 5 stars 107 4.2 out of 5 stars 9 4.2 out of 5 stars 180 4.2 out of 5 stars 48 3.7 out of 5 stars 48 4.0 out of 5 stars 7 Price £116.99£116.99 — no data £94.90£94.90 £58.99£58.99 £59.99£59.99 £139.00£139.00 Type Bluetooth Tube Preamp + Headphone Amplifier Bluetooth Tube Preamp + Headphone Amplifier Tube Phono Preamp + Headphone Amp MM Phono Preamplifier MM Phono Tube Preamplifier 2-CH 600W Digital Amplifier Input Bluetooth 5.0 (APTX-HD) + RCA + PC-USB Bluetooth 5.0 + RCA + U-disk + TF card MM/MC Phono + 3.5mm AUX MM Phono MM Phono + 3.5mm AUX single-ended RCA / balanced XLR Output Active Speaker + Amplifier + Headphone Active Speaker + Amplifier + Headphone RCA + 3.5mm Headphone Jack (can output at the same time) Active Speaker + Amplifier Active Speaker + Amplifier Stereo Passive Speakers + Active SUB Tone Control ✓ ✓ - no data - no data - no data Balance Control THD ≤0.01% ≤0.05% 0.2% ≤0.1% ≤0.1% 0.008% SNR ≥103dB ≥98dB ≥110dB ≥98dB ≥98dB ≥110dB Douk Audio X1 Nobsound NS-15G Nobsound NS-01G PRO Nobsound Q4 Douk Audio U3 Nobsound STB-01 Add To Basket Add To Basket Add To Basket Add To Basket Add To Basket Add To Basket Customer Reviews 4.0 out of 5 stars 55 4.5 out of 5 stars 59 4.4 out of 5 stars 1,166 4.3 out of 5 stars 46 4.5 out of 5 stars 59 4.5 out of 5 stars 126 Price £159.99£159.99 £76.99£76.99 £41.99£41.99 £65.99£65.99 £43.99£43.99 £38.00£38.00 Type 320W Bluetooth Tube MM Phono Amplifier 200W Bluetooth Amplifier 100W Bluetooth Amplifier USB Gaming DAC & Bluetooth Headphone Amp Digital Headphone Amplifier Record stabilizer