The Tonewinner AD-1PA+ is a high-performance Class A stereo power amplifier designed for audiophiles seeking exceptional musicality, power, and precision. Featuring an optimized circuit design and a fully balanced architecture, the AD-1PA+ delivers outstanding dynamics, clarity, and detail while preserving the integrity of the audio signal. With selectable Class A, Class AB, and Auto modes, this amplifier combines the warmth and purity of Class A operation with the efficiency of Class AB when required. Its robust construction, massive power supply, and meticulous internal layout ensure stable, noise-free, and highly musical performance, even with demanding loudspeakers. Key Features High-Power Class A Stereo Amplifier Delivers up to 300W RMS per channel at 8Ω Pure Class A output up to 100W at 8Ω Selectable Operating Modes Class A for maximum sound purity Class AB for higher efficiency Auto Mode automatically switches between Class A and AB based on temperature Balanced & Unbalanced Inputs Stereo XLR (balanced) input Stereo RCA (single-ended) input Powerful Amplification Stage Uses 8 pairs of high-power TTC5200 & TTA1943 transistors Excellent control, dynamics, and low distortion Massive Power Supply 1200W toroidal transformer 16 filter capacitors totaling 180,000µF Independent power supply for left and right channels Bi-Wiring Capability Dual speaker terminals allow bi-wiring for improved sound performance Excellent Isolation & Low Noise Design Physically separated internal sections to minimize interference High signal-to-noise ratio and wide frequency response Solid Aluminum Chassis Rigid construction for vibration control and durability Technical Specifications Amplifier Product Type: Stereo Power Amplifier Channels: 2 (Stereo) Amplification Type: Class A / Class AB Bias Modes: Class A / Class AB / Auto Power Output 300W RMS × 2 @ 8Ω (20Hz–20kHz, THD < 0.1%, both channels driven) 500W RMS × 1 @ 4Ω (20Hz–20kHz, THD < 0.1%) 320W RMS × 1 @ 8Ω (THD < 0.1%) Pure Class A Power: 100W @ 8Ω Audio Performance Frequency Response: 10Hz – 100kHz (+1/-3dB) THD+N: < 0.008% @ 1kHz Signal-to-Noise Ratio: ≥ 108dB (A-weighted) Channel Separation: ≥ 80dB Damping Factor: > 200 @ 8Ω Gain: 29.5dB ±1dB Input Sensitivity: 1.6V @ rated power (8Ω) Recommended Minimum Load: 2Ω per channel Connectivity Inputs: 1 × Stereo RCA 1 × Stereo XLR (Balanced) Outputs: Speaker terminals (A / B / A+B) Trigger: Input & Output General Power Supply: 110–240V AC, 50/60Hz Dimensions (W × H × D): 444 × 294 × 449 mm Net Weight: 43.4 kg Chassis Material: Aluminum Color: Black Included in Box Tonewinner AD-1PA+ Power Amplifier Power Cable
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