Classic Products A75 Class A Power Amplifier

The A-75 is the successor to the classic A-70 model, incorporating advanced technologies from and upgrading several components within its circuitry.

This high-end stereo power amplifier utilizes Mosfet field-effect transistors, achieving a pure Class A amplification with rated outputs of 480 Wx2 (12), 240 Wx2 (22), 120 Wx2 (42), and 60 Wx2 (89).

The dual-channel configuration features ten sets of balanced "power Mosfet" amplification modules. The all-balanced amplification technology offers significant advantages over conventional amplification methods, including improved symmetry, reduced distortion, enhanced stability, and robust driving capability.

The A-75 retains numerous exemplary designs while implementing comprehensive upgrades in several key technologies. Notably, it is equipped with the upgraded MCS+ circuit, a primary buffer amplifier circuit, and an improved multi-stage parallel circuit design. This design, combined with a current feedback mechanism, ensures linear response across various levels, while the parallel connection of the amplification unit circuit minimizes noise. Additionally, the driving section and MCS+ circuit are integrated with a direct current stabilization power supply, enhancing the signal-to-noise ratio and purifying the sound output.

To ensure a sufficient and stable power supply for the unit, the power section features a high-efficiency 1200VA transformer paired with four 100,000μF "large reservoir" filter groups, providing ample and stable power. The use of low dielectric constant and low loss Teflon-based materials, along with gold-plated connections at key input terminals, further enhances sound purity.

The oversized speaker output terminals facilitate easy connection to high-end speaker cables. The front panel showcases a fully digital display of the machine's operational mode, utilizing DSP digital circuitry to calculate and display output power and operational status.

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