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Airtight ATM4 Tube Amplifier
• Product Overview – Airtight ATM4 Tube Amplifier, released in 1998, is a solidly engineered Class AB push-pull tube power amplifier using EL34 output valves, renowned for musical coherence, tonal purity, and long-term reliability.
• Circuit Topology – Hand-wired point-to-point construction with high-quality output transformers and conservative operating parameters ensures low distortion, excellent bandwidth, and stable performance across a wide range of loudspeaker loads.
• Sonic Performance – Airtight ATM4 Tube Amplifier delivers a harmonically rich midrange, controlled bass authority, and smooth extended treble, excelling in realism, spatial depth, and long, fatigue-free listening sessions.
• Specifications – Stereo power output approximately 36 watts per channel into 8 ohms, EL34 output tubes, 4/8 ohm taps, wide bandwidth response, and high-quality valve rectification supporting dynamic musical transients.
• Dimensions – Approx. 360 mm (W) × 220 mm (H) × 310 mm (D), featuring a compact yet robust chassis layout optimized for heat dissipation and mechanical stability.
• Weight – Approximately 21 kg, reflecting heavy-duty transformers, thick chassis materials, and conservative mechanical design essential for stable tube operation and long-term sonic consistency.
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Hegel H390 Integrated Amplifier
• Hegel H390 Integrated Amplifier – A high-current Class AB design delivering exceptional control, low distortion and dynamic authority, offering reference-level performance for demanding loudspeakers and advanced audiophile systems.
• SoundEngine2 & Digital Architecture – Featuring Hegel’s SoundEngine2 error-cancellation technology, dual mono design and advanced DAC implementation, the Hegel H390 Integrated Amplifier achieves ultra-low noise, remarkable resolution and highly accurate musical timing.
• Connectivity & System Flexibility – With DLNA/UPnP streaming, AirPlay, Roon Ready support, coaxial/optical inputs, USB, analogue RCA and XLR, the Hegel H390 Integrated Amplifier integrates effortlessly into complex digital ecosystems with stable, high-bandwidth signal management.
• Power Delivery & Listening Behaviour – Delivering 250W per channel into 8 ohms with high damping factor, the Amplifier provides tight bass grip, expansive soundstage layering and effortless dynamic scaling across all playback levels.
• Product Dimensions – The Hegel H390 Integrated Amplifier measures 430 mm (W) × 115 mm (H) × 445 mm (D), offering a substantial yet rack-friendly footprint designed for optimal cooling and mechanical stability.
• Product Weight – Weighing approximately 20.5 kg, the Amplifier benefits from a rigid chassis and large toroidal transformer, improving noise isolation, transient control and overall sonic refinement.
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