Description

PH-A1J Power Transistor Discrete Configuration Headphone Amplifier from Japan Description FX-AUDIO- PH-A1J FX-AUDIO-Brand's first pure class A operating discrete analog headphone amplifier A headphone amplifier that has a gain adjustment and buffer with independent left and right operational amplifiers in the front stage and a discrete amplifier circuit with a power transistor in the rear stage. The main amplifier circuit has a discrete configuration with power transistors, which realizes powerful driving force while naturally reproducing the original sound. It is a headphone amplifier that can maximize the quality of headphones with the power of maximum output 1200mW. The NE5532P operational amplifier manufactured by Texas Instruments is used, which is a well-established two-circuit operational amplifier in our products, which is well-balanced in terms of cost and sound quality. Advanced users can enjoy getting closer to their favorite sound quality by replacing the operational amplifier! * Operational amplifier drive voltage: ± 12V Renewal to the second lot from January 10, 2019 sales The positive and negative power generation is a hybrid configuration from XL SEMI XL6019 with BD139, BD140 and TPS5430 (high-performance DC-DC converter with switching frequency of 500kHz), and ripple noise is greatly reduced. The improvement based on the basics of AUDIO, which is to improve the quality of the power supply, is a finish that will satisfy many headphone enthusiasts, including users of the first lot. In addition, in the first lot, there was almost no limit to the amount of current supplied, so some individuals generated a lot of heat, and there was a problem that it took a long time to stabilize under heat generation. Therefore, in the second lot, we set a limit on the current and succeeded in significantly reducing unnecessary heat generation! As the heat generation decreased, the thermal noise also decreased significantly. * Because it is pure A grade, fever does not disappear. Since the limited current is wasteful heat generation, the high-speed and thick listening taste produced by the post-stage amplifier circuit of discrete pure class A operation is maintained firmly. Since the parts other than the power supply have not changed, the model name has not changed and it is the second lot of PH-A1J, but it is a finish that can be said to be a substantial performance improvement. [Product features] ・ Discrete configuration amplifier using power transistor A discrete amplifier circuit with BD139 / BD140 power transistors manufactured by NXP Semiconductors is used for the main amplifier circuit. A powerful driving force is realized while having a natural sound quality.・ Pre-stage gain adjustment and buffer circuit with independent left and right operational amplifiers Two NE5532P operational amplifiers made by TI, a low-noise operational amplifier exclusively for audio, which are actively used in our products due to their excellent cost-sound quality balance, are installed in a left-right independent configuration. The gain adjustment circuit and the buffer circuit are configured by two operational amplifiers, respectively, and the configuration is made into a circuit configuration in which the left and right channels are independent. You can further improve the sound quality by replacing the operational amplifier. * Note) Replacement of the operational amplifier is not covered by the warranty.・ Commitment to capacitors A film capacitor made by WIMA of Germany, which has a good reputation for sound quality, is used for the coupling capacitor.・ Evolved into a high-quality power supply circuit With the version upgrade in the second lot, the positive and negative power generation is changed from XL6019 of XLSEMI to a hybrid configuration by BD139, BD140 and TPS5430 (high-performance DC-DC converter with switching frequency 500kHz), and ripple noise is greatly reduced. By updating the power supply circuit, which is the core of audio products, we are able to make our products even more satisfying.・ Equipped with an output protection circuit using a dedicated IC Output protection IC C1237HA and NEC high-quality sound relay are equipped with a protection circuit that cuts the output even in the unlikely event.・ Equipped with analog 2-system input switching function Despite its small size, it is equipped with two input terminals, a general RCA terminal and a 3.5mm stereo mini jack that is convenient for connecting to mobile terminals, smartphones, DAPs, etc. [Main ICs / elements] ■ Pre-stage voltage amplification / buffer circuit: Texas Instruments NE5532P operational amplifier Left and right independent 2 machine configuration Operational amplifier drive voltage ± 12V ■ Main amplifier circuit: BD139 / BD140 power transistor manufactured by NXP Semiconductors Discrete configuration with power transistor (pure class A operation) ■ Power supply circuit: BD139 / BD140 manufactured by NXP Semiconductors TPS5430 manufactured by TI Generates positive / negative 12V regulated power supply ■ Protection circuit: C1237HA Output protection IC A protection circuit is configured with a dedicated output protection IC for headphone output and a high-quality sound relay made by NEC [Notes] * The 3.5mm stereo mini jack input terminal is not covered by the operation guarantee for 4-pole plugs (TRRS). * This product is sold separately as a power supply. Please purchase an AC adapter separately. Recommended AC adapter: [Measurement data by analyzer] ・ Maximum output 1200mW when load is 16.5Ω ・ Maximum output 1000mW when load is 33Ω ・ Maximum output 710mW when load is 68Ω ・ Maximum output 485mW when load is 120Ω ・ Maximum output 410mW when load is 150Ω ・ Maximum output 220mW when load is 300Ω ・ Maximum output 115mW when load is 600Ω [Specifications] Color: Silver Product warranty period: 6 months from the date of purchase Front stage amplifier / buffer circuit: Nexus Instruments NE5532P operational amplifier Left and right Ch independent configuration Rear stage amplification circuit: NXP Semiconductors BD139 / BD140 Discrete configuration Input terminal: [LINE-IN1] 3.5mm stereo mini jack * [LINE-IN2] stereo RCA terminal * 4 pole plug is not covered by operation guarantee Output terminal: Standard headphone jack (Φ6.3mm TRS phone jack) Output: 115mW ~ maximum 1,200mW (@ 16Ω) Frequency characteristics : 10Hz ~ 30kHz THD + N (Total Harmonic Distortion): 0.0013% SN Ratio: 111.3dB Corresponding Impedance: 16Ω ~ 600Ω Power Supply: DC12V Power Supply Capacity 1A or More (AC Adapter Sold Separately) Power Supply Connector: DC Jack Outer Diameter 5.5mm x Inner Diameter 2.1mm (Center Plus specification) Function: Analog 2 system input switching protection circuit: Overcurrent protection function (output protection) Accessories: Simple manual Size: Height 27mm x Width 73mm x Depth 128mm (excluding protrusions) Weight: 235g * Specifications and design are subject to change without notice due to improvements, etc. Payment You can pay with management payments. We will ship the item 10 business days after your payment clears. Shipping I ship it in Japan post EMS or DHL or FedEx . I attach the tracking number. Please bid it without worrying. Shipping is only available to the address registered in Paypal. Please note that any address not registered in Paypal is not acceptable to ship. International Buyers - Please Note: Hello, As I have earned only a few feedbacks, you may be very worried to bid my auction. However, I will provide courteous and responsive service. If you are looking for a particular item that is not in my listing, please do not hesitate to contact me. I will look it for you. Thank you, Arigatou. International buyers Please note Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility. Please check with your country's customs office to determine what these additional costs will be prior to bidding or buying. 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