Features T4 PLUS tube preamplifier meets more HiFi audio needs: MM/MC phono input, supports multiple input impedance switching (1K/470/220/100/47/22/10), converts phono signal to line level signal, low-noise integrated circuits and high-quality components ensure clear sound. 3.5mm AUX input, amplifies low-level audio signals from mobile phones, tablets, PCs, MP3s, etc., making it easier to drive amplifiers or active speakers and greatly improve sound quality. Unique and amazing combination in appearance: T4 PLUS preamp is integrated with retro tubes and VU meters. When listening to HiFi music, the hands dance under the warm light, with a rich retro feeling, dynamically decorating the sound system, giving Your Unique Audio Enjoyment It delivers big dynamics and sweet tube sound even in a limited space. Imported JAN5654 tube and vintage warm sound: Equipped with JAN5654 tube by default, it improves everything related to your music, such as detail, transparency, immediacy, richness, dynamics, tone, etc. , much better than the 6J1 series, especially for vocals. The pluggable tube socket facilitates tube rolling and sound shaping, making it easy to select and change the sound characteristics according to your preferences. 3.5mm headphone output and perfect circuit design: T4 PLUS also has a built-in classic headphone amplifier circuit (2* NE5532), which can easily drive 32-300 ohm headphones. Reasonable and advanced architecture, TI TPS5430+7205MOS power management, TL071+JRC2068 phono preamp circuit, etc., enjoy HiFi analog sound and first-class design at an unparalleled low cost. Mini size, excellent performance: All designs are full of details, solid aluminum alloy knobs, gold-plated terminals, gray one-piece aluminum alloy shell, built-in VU meter decoration, retro and elegant. It is not only an MM/MC phono preamplifier, but also a stereo audio preamplifier and headphone amplifier, specially designed for audiophiles who pursue HiFi sound quality. Warm reminder: 1. The 3.5mm AUX input takes priority. If you want to use the MM/MC phono input, please make sure the AUX cable is unplugged. 2. The stereo RCA and 3.5mm headphone jacks can output at the same time, and the knob can also control the volume of the two outputs at the same time. Parameters: Douk Audio Model: T4 PLUS Audio input: MM phono/Turntable/3.5mm AUX Audio output: Stereo L/R RCA/3.5mm headphone jack Headphone jack maximum output power: 150mW@32 Matching headphone impedance: 32-300 AUX IN