Vacuum Tube Hybrid Preamp with Tone Control Function FX-AUDIO- TUBE-03J+ [Black]

【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. Op-amp & vacuum tube hybrid preamplifier It uses a 6K4 vacuum tube as standard, and has a two-stage gain setting function (High/Low). Tone control function (tone direct function) It features a power supply active filter circuit using power transistors. AC adapter required (sold separately) DC12V/1A DC jack 5.5mm x 2.1mm (center positive) This product is a hybrid type preamplifier that combines vacuum tubes and operational amplifiers. The configuration uses an operational amplifier in the preceding stage to adjust volume and tone quality, and a vacuum tube in the subsequent stage to add harmonic components. By utilizing the advantages of both the vacuum tube and the operational amplifier, you can enjoy the unique sound of vacuum tubes without unpleasant distortion, even at maximum volume. Furthermore, while incorporating highly regarded audio-specific components throughout, making it suitable for serious audio applications, it is also offered at an affordable price. The product will be renewed to its 4th production batch, starting with sales on December 11, 2024. - Replaced input/output coupling capacitors with TDK EPCOS MKT capacitors. By employing capacitors that offer high-resolution, high-quality sound without the harshness that can lead to listening fatigue, these headphones enhance the sound quality of the vacuum tubes. - Other minor parts changes There are no changes to the main board circuitry this time. [How to use] Please use this product by placing it between the output of your audio playback device (such as a CD player, DAC, or silicon player) and your power amplifier. INPUT: Connect to the analog output terminal of a CD player, DAC, etc. OUTPUT: Connect to the analog input terminal of a power amplifier, main amplifier, etc. [Product Features] ■ 6K4 is used as the standard included vacuum tube. The TUBE-03J used a 6J1 military-grade vacuum tube as its included component, but since the 6J1 is now difficult to obtain, the TUBE-03J+ uses a 6K4 as its standard component. The design itself is based on the 6J1 and has been adjusted to work without problems with the 6K4, but to experience its full potential, we recommend the 6J1 (sold separately). It's not that the 6K4 is bad, but rather that it has a different character, so trying out different vacuum tubes to find your favorite is one of the joys of the TUBE-03J+. ■Hybrid preamplifier using vacuum tubes and operational amplifiers The pre-amp buffer and tone control sections utilize the Texas Instruments NE5532 audio operational amplifier (DIP socket type), which is renowned for its superior sound quality! The subsequent stage features a hybrid configuration of vacuum tube circuitry, utilizing the advantages of both vacuum tubes and operational amplifiers to deliver high-resolution sound quality with depth and richness. ■ Tone control function (tone direct function) ■ Gain setting function The DIP switches on the back of the unit allow for two levels of gain setting: High and Low. ■ Equipped with a power active filter circuit using power transistors. ■ Our commitment to the parts we use ■ Improving characteristics through artwork revisions ■Fully functional even with DC12V, and complete noise suppression through voltage boosting. [Caution] *AC adapter sold separately. Please purchase the recommended AC adapter at the same time. *This unit is a preamplifier. A separate power amplifier is required to connect to passive speakers (which do not have a built-in amplifier). [Product Specifications] Brand: FX-AUDIO- Product warranty period: 6 months from the date of purchase Input terminals: Stereo RCA terminals Output terminals: Stereo RCA terminals Features: Tone control function (BASS/TREBLE), Gain setting function (High/Low), Tone direct function Power supply: Rated voltage DC12V, power capacity 1A or more (AC adapter sold separately) Power connector: DC jack, outer diameter 5.5mm, inner diameter 2.1mm (center positive) Accessories: Instruction manual, 2 x 6K4 vacuum tubes (the type will be one of the following pairs: Shuguang, Beijing, or Shanghai; you cannot choose the type). Dimensions: Height 33mm (maximum 76mm including vacuum tube) x Width 98mm x Depth 118mm (excluding protrusions) Weight: 318g (with included vacuum tubes installed) *Specifications and design may be changed without notice due to improvements or other reasons.