http://www.airtight-anm.com/components/am201h.html Beautiful Tube sound for serious audiophiles - a rare AT amp - which is aesthetically both modern and vintage. You have to listen to soul touching audio this unit delivers. Price is negotiable within reason and will be discussed only with genuine buyers who contacts over Phone or WhatsApp Features - Pure, transparent sound with the renowned AIR-TIGHT musicality derived from our time-tested valve technology. - Useful auto-bias system for safe and reliable operation under parallel push-pull configuration. - 100% hand-elaborated, point-to-point, PCB-free wiring for stable, long-life performance. - Luxurious cosmetics featuring thick aluminium extruded front & rear panels, bias balance meter. - Headphones Output Specifications - Output power: 22W+22W, 4Ω/8Ω (rms) - Valves employed: EL84(6BQ5/6P14)x8, 12AX7x1, 12AU7x2 - Input impedance: 100kΩ - Output impedance: : 4Ω, 8Ω - THD: 1%(1kHz) - Frequency response: 20~25kHz - Input sensitivity: 230mV - S/N ratio: 90dB - Dimensions: 358(W) x 295(D) x 173(H)mm - Weight: 15kg