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

---------------------------------------------------------------------- 【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. ----------------------------------------------------------------------

Op-amp & Vacuum Tube Hybrid Preamp Standard vacuum tube is 6K4, and two-stage gain setting function (High/Low) Tone control function (tone direct function) Equipped with a power transistor active filter circuit 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 volume and sound quality are adjusted using an operational amplifier placed in the front stage, and harmonic components are added using a vacuum tube in the rear stage. By taking advantage of the strengths of both vacuum tubes and operational amplifiers, you can enjoy the distinctive sound of vacuum tubes without unpleasant distortion, even at maximum volume. In addition, we have incorporated well-established audio-specific components throughout the product to enable it to be used for serious audio applications, while still achieving an affordable price. The 4th lot will be released on December 11, 2024. - Input and output coupling capacitors changed to TDK EPCOS MKT capacitors We have adopted capacitors that are characterized by high-resolution sound quality, while having a gentle and warm sound, without the harshness that can lead to listening fatigue, thereby enhancing the sound quality of vacuum tubes. ・Other minor part 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, or silicon player 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 a power amplifier, main amplifier, etc. [Product Features] ■Uses 6K4 as standard vacuum tube The TUBE-03J came with a 6J1 military tube, but since the 6J1 is now difficult to obtain, the TUBE-03J+ comes standard with the 6K4. The design itself is based on the 6J1 and has been adjusted to work with the 6K4 without any problems, but we recommend the 6J1 (sold separately) to experience its true capabilities. It's not that the 6K4 is bad, but rather that it's a difference in flavor, so one of the joys of the TUBE-03J+ is trying out your favorite vacuum tube. ■Hybrid preamplifier using vacuum tubes and operational amplifiers The pre-buffer and tone control sections use the Texas Instruments audio operational amplifier "NE5532" (DIP socket type), which is renowned for its sound quality! The latter stage is a hybrid configuration with a vacuum tube circuit, and by utilizing the strengths of both vacuum tubes and operational amplifiers, you can enjoy high-resolution sound quality with depth and richness. ■ Tone control function (tone direct function) ■Gain setting function The DIP switch on the back of the unit allows for two gain settings: High and Low. ■ Equipped with a power transistor power supply active filter circuit ■ Attention to detail in the parts used ■Improved characteristics through artwork revision ■Full-scale operation with DC12V, and complete noise suppression by boosting voltage [Note] *The AC adapter is sold separately. Please purchase the recommended AC adapter at the same time. *This unit is a preamplifier. To connect to passive speakers (without a 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 Functions: 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, two 6K4 vacuum tubes (types will be a pair of either Shuguang, Beijing, or Shanghai; you cannot choose) Size: Height 33mm (maximum 76mm including vacuum tube) x Width 98mm x Depth 118mm (excluding protrusions) Weight: 318g (with attached vacuum tube) *Specifications and design may be changed without notice due to improvements or other reasons.