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【Voltage Compatibility】
When using electrical appliances, please note that they are designed for Japanese voltage specifications (90-110V), so if you use them with a different voltage, it may cause a malfunction.
【Plug Type】
Our products use Japanese plug types (A or B type).
Please use a conversion adapter if necessary.
【Important Note on Transformers and Adapters】
A transformer adjusts voltage to match your device’s requirements.
A conversion adapter only changes the plug shape and does not adjust voltage.
Using only a conversion adapter without a transformer may result in damage to the product.
【Liability】
We are not responsible for malfunctions or damages caused by improper use, such as operating the product without a transformer.
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Three functions in one: MM phono preamplifier/tube preamplifier/headphone amplifier: The T4 PRO is more than just a phono equalizer. It features an MM phono input for connecting a record player, a 3.5mm AUX input for connecting smartphones and PCs, and stereo RCA output and headphone output. This allows you to freely switch between functions depending on your needs: as a phono preamplifier to power your power amplifier/active speakers, as a tube preamplifier to enhance the sound quality of digital audio sources, and as a headphone amplifier for private listening.
Vintage warmth delivered by JAN5654 vacuum tubes: The amplification stage comes standard with the US-made military-grade vacuum tube "JAN5654". Compared to the 6J1 series, this vacuum tube is significantly superior in detail, transparency, richness, dynamics, and especially vocal expression. It softens the harsh impression often associated with digital audio sources, giving music "warmth" and "depth". Furthermore, since the vacuum tubes are socketed, they can be replaced (tube rolling), allowing you to pursue your preferred sound.
Accurate Analog Reproduction with MM Phono Input + RIAA Equalizer: The output from a record player's MM cartridge does not have a flat sound quality characteristic on its own, requiring a correction circuit called RIAA. The T4 PRO is equipped with an RIAA equalizer circuit using high-quality, low-noise integrated circuits and carefully selected components. It accurately amplifies and corrects the weak signal from the cartridge, outputting a clear and clean line-level signal. You can enjoy the rich sound quality inherent in records to the fullest with a modern audio system.
Built-in headphone amplifier supporting 32Ω to 300Ω: The T4 PRO incorporates a classic headphone amplifier circuit (NE5532 x 2). With a maximum output of 150mW at 32Ω, it can drive a wide range of headphones, from high-sensitivity earphones to high-impedance headphones up to 300Ω. This is useful when you want to listen to records at night without disturbing your family, or when you want to enjoy high-quality sound on a desktop where you don't have a proper speaker setup. The RCA output and headphone output can be simultaneously, and the volume can be controlled together with the knob.
Compact and elegant aluminum casing with user-friendly design: The body features a one-piece molded gray aluminum alloy shell accented with a special red vacuum tube cover and knob. The design combines vintage charm with elegance. Measuring a very compact 95 x 117 x 30 mm (excluding vacuum tubes), it fits neatly into desk corners or rack gaps. Power is supplied via the included DC 12V adapter. Operation is simple; after powering it on, volume can be adjusted with a single knob.
Product Overview: The warmth of vinyl records, the rich resonance of vacuum tubes, and private listening with headphones. This single unit completes your desk audio setup. The Douk Audio T4 PRO is an all-in-one mini preamplifier that condenses three functions—MM phono preamplifier, vacuum tube audio preamplifier, and headphone amplifier—into a compact body. It accurately corrects the weak signal from the MM cartridge of your record player with an RIAA equalizer. Furthermore, the 3.5mm AUX input transforms digital audio sources from smartphones and PCs into the warm analog sound of JAN5654 vacuum tubes. The built-in headphone amplifier supports 32Ω to 300Ω. It's ideal for those who want to enjoy records, streaming, and headphones all in high quality in a small space.
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