MITSUBISHI DA-A600

Pre owned. In fair condition. Shows several signs of wear, also visible in the photos on the edges. Without original packaging.

The Mitsubishi DA-A600 is a Japanese-made stereo power amplifier produced between the late 1970s and early 1980s, belonging to the historic Mitsubishi/Diatone hi-fi line, designed to deliver high performance and strong reliability for domestic audio use.

It is a solid-state power amplifier featuring a differential two-stage circuit architecture with a current mirror drive and a fully DC-coupled OCL complementary configuration, engineered to ensure linearity, stability, and low distortion even at high listening levels.

Rated output power is around 50 watts per channel into 8 ohms, with higher capability into 4 ohm loads, providing good loudspeaker control and a solid, well-managed dynamic response for its class.

Frequency response is wide, typically ranging from about 5 Hz to 70 kHz, while total harmonic distortion remains very low, reflecting a design focused on signal purity and natural tonal balance.

The signal-to-noise ratio is high for its era, contributing to a quiet and detailed reproduction, while the damping factor ensures solid low-frequency control and a tighter, more precise bass response.

Build quality is robust and typical of Japanese vintage engineering, featuring a strong metal chassis and a clean internal layout designed to minimize interference and ensure long-term reliability.

Thanks to its balanced sonic character, solid bass control, and the typical musicality of Diatone electronics, the DA-A600 is now considered a classic vintage amplifier, appreciated by enthusiasts for its reliability and for a clean, dynamic sound that remains highly enjoyable even in modern hi-fi systems.

Technical specifications:

• Type: stereo power amplifier
• Circuit design: two-stage differential amplifier; current mirror drive; 2-stage Darlington OCL pure complementary configuration
• Continuous output power (THD 0.05%): 50 W + 50 W into 8 Ω (20 Hz – 20 kHz); 55 W + 55 W into 4 Ω (20 Hz – 20 kHz)
• Output power at 1 kHz: 55 W + 55 W into 8 Ω; 65 W + 65 W into 4 Ω
• Total harmonic distortion (8 Ω, both channels): ≤ 0.008% at 1 W (20 Hz – 20 kHz); ≤ 0.003% at 25 W (1 kHz)
• Intermodulation distortion: ≤ 0.01% (50 Hz : 7 kHz = 4:1, 8 Ω, 1 W)
• Frequency bandwidth (THD 0.1%): 5 Hz – 70 kHz
• Input sensitivity / impedance: 1 V / 50 kΩ (1 kHz, 8 Ω)
• Damping factor: ≥ 50 (20 Hz – 20 kHz, 8 Ω)
• Residual noise: ≤ 0.17 mV (input shorted, 8 Ω)
• Channel separation: ≥ 75 dB at 1 kHz; ≥ 50 dB at 20 kHz
• Semiconductors used: 30 transistors; 18 diodes
• Power supply: 100 VAC, 50/60 Hz
• Power consumption: 120 W operating; 186 W rated output (8 Ω, both channels, 1 kHz)
• Dimensions: 480 x 139 x 324 mm (W x H x D)
• Weight: 7.5 kg