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Specifications ; Total harmonic distortion · 0.008% ; Signal to noise ratio · 62dB (MC), 82dB (MM), 90dB (line) ; Output · 1.8V (Pre out) ; Dimensions · 482 x 70 x View and Download Nikko BETA II service manual online. w, e, n, d - type. BETA II amplifier pdf manual download. PRE-AMPLIFIER. BETA400. SAFETY INSTRUCTIONS. INSTRUCTION MANUAL. MODE D'EMPLOI. NIKKO. BETA 4. SAFETY INSTRUCTIONS page 1. OPERATING INSTRUCTIONS page 2. Download NIKKO BETA 30 30S 50 50S AMPLIFIER SM service manual & repair info for electronics experts.