Tonewinner flagship pure Class A amplifier---AD-2PRO+

The AD-2PRO+ is Tonewinner's latest flagship pure Class A amplifier, refined over twenty years from the original AD-2 model. It features significant enhancements in circuit design, aesthetics, and performance, earning praise from audiophiles. Today, it sets the standard for Class A amplifiers in the domestic audio market and is a standout among Tonewinner's high-end products.

**Intuitive Cover Inspection**

Opening the top cover reveals the left and right channel power amplifier circuit boards, located in metal compartments beside the heat sinks. These boards contain resistors, capacitors, and transistors, which form the amplifier's core circuitry. Below, you will find photos of the printed circuit boards and a simplified circuit diagram for better clarity.

**Classic Hi-End Circuit**

The AD-2PRO+ features advanced hi-fi circuitry designed for exceptional audio quality. It has a dual-supply symmetrical design with differential amplifiers and temperature-controlled compensation circuitry.

Utilizing multiple Darlington transistors, it creates a complementary push-pull amplifier with a BTL bridged arrangement that minimizes distortion and enhances sound purity and clarity.

The precision required for components and transistor pairing increases production costs, resulting in many imported models of similar quality retailing for hundreds of thousands of yuan, which can be daunting for audiophiles.

**The Most Luxurious Materials**

The AD-2PRO+ features advanced amplifier circuitry with hundreds of resistors and capacitors, and over forty power transistors. It uses 24 of Toshiba's classic high-power tube pairs, the TTC5200/TTA1943. With enhanced protection measures, it delivers an output of 2 × 240W (8Ω) and around 2 × 85W in pure Class A power. This ensures that the most linear portion of the power reserve reaches the speakers, providing an effortless and enjoyable listening experience across the entire frequency range!

**The most stunning and mellow sound quality**

Thanks to this amplifier's premium hi-fi circuitry, superior components, and meticulously crafted construction, the listening experience is truly exceptional: refined texture, vibrant timbre, and a significantly enhanced sound shaping compared to previous generations. The AD-2PRO+ boasts a balanced, three-band sound, offering a pin-drop audible in its delicate, earth-shattering power. Its sound quality is neutral to warm, as bright as the spring sun. Its highs are melodious and vibrant, its mids are rich and powerful, and its lows are rich and steady. Its massive, solid texture is truly breathtaking!

**Latest Modern High-Tech Features**

The AD-2PRO+ features a USB-AUDIO interface on the back panel, powered by the CT7601PR USB decoding chip. This allows direct connection to a PC, utilizing its large hard drive and lossless music library. With foobar2000 playback software, it decodes streams like DSD512 and PCM 32-bit/768kHz. The built-in ES9038 chip decodes high-bitrate DSD audio, and after processing through shaping and filtering circuits, the analog hi-fi circuitry amplifies the signal, providing undistorted, high-quality audio—a performance level not typically seen in other hi-fi amplifiers!

**Listening Experience**

After reviewing the Tonewinner AD-2PRO+ and testing various setups, I found its classic circuit design, exquisite craftsmanship, and sturdy materials impressive. With precise tuning, abundant Class A power, and unmatched output, it delivers a magnificent sound worthy of its flagship status.

Considering that similar imported hi-fi amplifiers cost five times more, the AD-2PRO+ demonstrates exceptional value for money. With such a compelling experience, it's hard to find a reason not to choose it!