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

【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. Opamp & Vacuum Tube Hybrid Preamp 6K4 is used as the standard vacuum tube, and 2-step gain setting function (High/Low) Tone control function (tone direct function) Equipped with 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 a vacuum tube and an operational amplifier. The operational amplifier placed in the front stage adjusts the volume and sound quality, and the vacuum tube in the latter stage adds harmonic components. By leveraging the strengths of both the vacuum tube and operational amplifier, you can enjoy the unique tone of a vacuum tube without unpleasant distortion even at maximum volume. In addition, we have achieved an affordable price while incorporating well-established audio-specific components throughout so that it can be used in serious audio applications. Renewal to 4th lot from sale on December 11, 2024 ・Change the input/output coupling capacitor to TDK EPCOS MKT capacitor The sound quality of vacuum tubes is enhanced by using a capacitor that produces high-resolution sound that is gentle and warm, without the harshness that can lead to listening fatigue. ・Other minor parts changes There are no changes to the main board circuit this time. [How to use] Please use this product by placing it between the output of a sound source playback device such as a CD player, DAC, silicon player, etc. and a power amplifier. INPUT: Connect to the analog output terminal of a CD player, DAC, etc. OUTPUT: Connect to the analog input terminal of power amplifier, main amplifier, etc. [Product features] ■6K4 is used as the standard vacuum tube The TUBE-03J used a 6J1 military tube as the attached vacuum tube, but since 6J1 is already difficult to obtain, the TUBE-03J+ uses a 6K4 as standard. The design itself is based on the 6J1, and has been adjusted so that there will be no problems with the 6K4, but we recommend the 6J1 (sold separately) to experience its true potential. It's not that 6K4 is not good, it's just that the taste is different, so one of the fun things about TUBE-03J+ is to try out your favorite vacuum tube. ■Hybrid preamplifier with vacuum tube and operational amplifier The pre-stage buffer section and tone control section use the Texas Instruments audio operational amplifier "NE5532" (DIP socket type), which has a reputation for sound quality! The latter stage has a hybrid configuration with a vacuum tube circuit, and by taking advantage of the strengths of both vacuum tubes and operational amplifiers, you can enjoy high-resolution sound quality, deep, and flavorful sound quality. ■Tone control function (tone direct function) ■Gain setting function The DIP switch on the back of the main unit allows for two-step gain settings: High/Low. ■Equipped with a power supply active filter circuit using power transistors ■Focus on parts used ■Improved characteristics by reviewing artwork ■ Full-fledged drive even with DC12V, perfect noise countermeasures due to step-up [Note] *AC adapter is sold separately. Please purchase the recommended AC adapter at the same time. *This unit is a preamplifier. To connect to passive type speakers (not built-in amplifier), a separate power amplifier is required. [Product specifications] Brand: FX-AUDIO- Product warranty period: 6 months from the date of purchase Input terminal: Stereo RCA terminal Output terminal: Stereo RCA terminal Function: 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 plus specification) Accessories: Instruction manual, 2 6K4 vacuum tubes (one pair of Shuguang, Beijing, and Shanghai types cannot be selected) Size: Height 33mm (maximum 76mm including vacuum tube) x Width 98mm x Depth 118mm (*excluding protrusions) Body weight: 318g (with attached vacuum tube attached) *Specifications and design may change without notice due to improvements or other reasons.