Fosi Audio GR70 Vacuum Tube Headphone Amplifier featuring 2 x 5654W vacuum tubes and 2 x 6AC7 a mini HiFi preamplifier for home with and supporting

【Important Notice for International Buyers – Tomoayax Premium Audio Hi-Fi Japan】

■ Voltage Compatibility This product is designed exclusively for use in Japan (AC 100V, 50/60Hz).

Many regions use 120V or 220–240V. Using this product without a proper transformer in such voltage environments may result in malfunction, overheating, or serious and irreversible damage.

■ Plug Type This product uses a Japanese plug (Type A or B). A plug adapter may be required depending on your region.

■ Transformer Requirement (Very Important) A transformer is required for safe use.

A plug adapter only changes the plug shape and DOES NOT convert voltage. Using this product without a transformer may cause serious and irreversible damage.

■ Buyer Responsibility As this is high-end audio equipment, the buyer is fully responsible for confirming compatibility with their local voltage (100V / 120V / 220–240V) and usage environment before purchase.

■ No Return / No Refund Policy We do NOT accept returns or refunds for: ・Voltage mismatch (including 120V and 220–240V environments) ・Use without a transformer ・Plug incompatibility ・Damage caused by improper setup or usage

■ Liability We are not responsible for any damage, malfunction, or performance issues caused by improper use or incorrect voltage conditions.

■ Final Notice Please ensure full understanding of the above before purchasing. Use only under the correct voltage environment. 【Pure Vacuum Tube Amplifier】The GR70 headphone vacuum tube amplifier blends vintage charm with the latest technology to deliver the true essence of vacuum tubes. Ideal for headphone enthusiasts, it delivers superior sound quality when paired with over-ear or in-ear headphones. [Quad Tube] This amplifier employs a two-stage amplification system using two 5654W vacuum tubes and two 6AC7 vacuum tubes. The 5654W vacuum tubes amplify the voltage, while the 6AC7 vacuum tubes handle power amplification. This configuration results in a balanced, transparent, and textured sound. 【User-Friendly Design】This vacuum tube headphone amplifier preamplifier offers intuitive controls such as a large volume knob, vents on both sides, bass and treble controls, and high-impedance and low-impedance mode switching, making it versatile for various uses. 【Two-in-One】Supports switching between low-impedance and high-impedance modes suitable for headphones from 16Ω to 300Ω. Features a 6.35mm/3.5mm headphone jack on the front and RCA input/output on the back, enabling integration with home audio HiFi systems. 【Compact yet powerful】Featuring a CNC-machined aluminum alloy body, the GR70 combines durability with a sophisticated design. Despite its compact size, it delivers a maximum output of 300mW and a 1.2V RCA output with a signal-to-noise ratio of over 97dB, providing a warm, clean, and dynamic sound. Fosi Audio GR70 Vacuum Tube Headphone Amplifier Preamplifier: Equipped with 2 x 5654W vacuum tubes and 2 x 6AC7 vacuum tubes. A mini HiFi preamplifier for home audio. Features 3.5mm and 6.35mm jacks and supports impedances from 16 to 300 ohms.