La coppia 420/521 si presenta con ottime credenziali tecnologiche dettaglio dei comandi a push. il front and delle apparecchiature si presenta molto aggressivo e ben identificabile nei comandi il suono e' quello tipico Marantz . gli oggetti sono funzionanti e ben conservati Specifications Amplifier PM 420 Power output: 40 watts per channel into 8Ω (stereo) Frequency response: 10Hz to 30kHz Total harmonic distortion: 0.05% Damping factor: 50 Input sensitivity: 2.5mV (MM), 150mV (line) Signal to noise ratio: 81dB (MM), 90dB (line) Output: 380mV (line) Speaker load impedance: 4Ω (minimum) Dimensions: 416 x 73 x 300mm Weight: 5.8kg Year: 1982 Specifications Tuner 521 Type: Mono/Stereo Tuner Tuning Bands: FM, MW Tuning Scale: Digital FM Tuning Range: 87.5 to 108 MHz MW Tuning Range: 522 to 1611 kHz Sensitivity: 1.4uV (FM), 10uV (MW) Signal to Noise Ratio: 68dB (FM), 54dB (MW) Distortion: 0.2% (FM), 0.3% (MW) Selectivity: 70dB (FM), 40dB (MW) Frequency response: 30Hz to 15kHz (FM) Dimensions: 416 x 55 x 300mm Weight: 2.95kg