A compact integrated amplifier meticulously crafted for sound quality, operability, and finish. The power supply section features a toroidal transformer co-developed with a transformer manufacturer. This transformer employs an elliptical core cross-section instead of the typical square shape, increasing wire winding tension and reducing vibration to less than one-fourth of conventional levels. This achieves a compact power supply section with superior sound quality. Furthermore, it employs an S.T.D. power supply that independently supplies power to the preamp section (voltage amplification stage), which handles small signals, and the power section (power amplification stage), which handles large signals. This method separates and isolates the rectifier circuits, preventing voltage fluctuations in the power section from affecting the preamp section even during high output. This also provides high drive capability for low-impedance speakers. MOS-FETs are employed in both the drive stage and final stage of the power section. MOS-FETs feature high input impedance, enabling electrical isolation from preceding stages and reducing susceptibility to noise current ingress. They also exhibit low levels of audibly noticeable odd-order distortion, delivering smooth sound quality. Furthermore, the power stage employs a single push-pull configuration with minimal crossover distortion. Leveraging the MOS-FET's inherent stability against thermal fluctuations, a fixed optical bias circuit is adopted, effectively maintaining a constant current value. This ensures stable operation of the output stage. The power transistors are directly mounted onto a robustly constructed chassis, effectively suppressing vibration while eliminating the need for large, space-consuming heat sinks. The chassis employs a monobox structure, combining aluminum and steel with sufficient thickness and strength to achieve high rigidity. The TA-F5000 further gains damping effects by combining aluminum and steel—materials with different natural frequencies—to cancel mutual resonance. The front panel utilizes aluminum material approximately 10mm thick. The feet employ eccentric insulators that resist external vibrations without creating sharp peaks. The tone and balance circuits employ a center-defeat volume control of the same grade as the master volume. This volume control disconnects both the tone control circuit and the balance circuit from the signal path when the knob is centered. This eliminates unnecessary circuitry and the switch itself, resulting in purer sound quality. High-quality components, rigorously selected for their sonic characteristics, are used for resistors, capacitors, and other parts. A noise-cut input selector is employed for input switching. This system uses relays to isolate the input of any unselected source component, eliminating crosstalk between sources. A CR-NF type phono equalizer amplifier is used. A head amplifier for MC cartridges is also included. Pre-out output terminals are provided. Model Stereo Integrated Amplifier Circuit Configuration Power Amplifier Section: Preamplifier Section: Power Supply Section: Super Legato Linear Fully Direct-Coupled Pure Complementary Darlington SEPP MOS-FET Power Amplifier Low-Noise Equalizer Amplifier + MC Head Amplifier Large-Capacity Toroidal Transformer + S.T.D. Power Supply Rated Output 45W+45W (4Ω load, 20Hz–20kHz, 0.03% THD) Suitable Speaker Impedance 4Ω to 16Ω Output Bandwidth 10Hz to 100kHz (4Ω load, 10W output, THD 0.08%) Total Harmonic Distortion 0.008% (8Ω load, 10W) Intermodulation Distortion (60Hz:7kHz = 4:1) 0.008% (8Ω load, rated output) Equalizer Characteristics ±0.3dB (Phono MM, 20Hz–20kHz) Frequency Response 5Hz–100kHz +0 -3dB (Tuner, CD, AUX, Tape, MD) Input Sensitivity/Impedance Phono MC: 180μV/100Ω Phono MM: 1.6mV/50kΩ Tuner, CD, Aux, Tape, MD: 150mV/20kΩ SN Ratio Phono MC: 75dB (A Fil, 0.5mV) Phono MM: 85dB (A Fil, 5mV) Tuner, CD, Aux, Tape, MD: 100dB (input shorted) Output Voltage/Impedance MD Rec out, Tape Rec out: 150mV/1kΩ Pre out: 600mV/200Ω Headphone Output Level 10mW (8Ω, compatible with Low/High impedance headphones) Tone Control Bass: ±6dB (100Hz) Treble: ±6dB (10kHz) Power Supply AC100V, 50Hz/60Hz Power Consumption 100W Auxiliary Power Outlets Power Switch Linked: 2 outlets (total 100W) Dimensions Width 280 x Height 100 x Depth 400 mm Weight Approx. 7kg The exterior shows signs of use and aging, including scratches and stains. Power, sound output, and basic functions have been verified. A separate universal cable is included. accessories 　　・　200V to 100V voltage converter and adapter plug This product is designed for use in Japan and has a rated voltage of 100V. Therefore, for customers with a 200V household power supply, we will include a voltage converter. Additionally, we will also include a power plug compatible with European standards. This will allow you to enjoy the audio system immediately upon receiving the product. (Please see the last photo.) Shipping from Japan with Tracking Number & Insurance. I promise fast shipping via FedEx or DHL as soon as possible! Import duties, taxes and charges are not included in the item price or shipping charges. These charges are the buyer’s responsibility. These charges are normally collected by the delivering freight (shipping) company or when you pick the item up - do not confuse them for additional shipping charges.