Very nice Rotel tuner. Good stereo reception, even with short antenna. Number of Transistors Semiconductors present. Semiconductors Main principle PLL, Phase-locked loop Wave bands Broadcast (BC) and FM or UHF. Details Hi-Fi equipment Power type and voltage Alternating Current supply (AC) / 120 or 220 or 240 Volt Loudspeaker - For headphones or amp. Material Wooden case Model: AM/FM Stereo Tuner RT-426 - Rotel, The, Co., Ltd.; Tokyo Shape Book-shelf unit. Dimensions (WHD) 430 x 144 x 286 mm / 16.9 x 5.7 x 11.3 inch Notes A stereo hi-fi tuner covering MW and FM with NFB Phase Lock Loop Multiplex. With a Signal Strength meter, FM Stereo indicator, rotary Function switch (AM, FM, FM Auto), push button switches for Hi-Blend and Muting, an adjustable AM ferrite bar aerial on the back, terminals for AM and FM antennae and RCA phono sockets for Line Output. SPECS: FM Tuner Section Usable Sensitivity Mono Stereo 10.3dBf (1.8µV/300Ω) 18.2dBf (4.9µV/300Ω) 50dB Quieting Sensitivity Mono Stereo 14.8dBf (3.0µV/300Ω) 37.6dBf (42µV/300Ω) Signal-to-Noise Ratio (at 65dBf) Mono Stereo 75dB 66dB Distortion (at 65 dBf) 100Hz 1kHz 6kHz 0.15%(mono), 0.3%(Stereo) 0.2%(mono), 0.3%(Stereo) 0.3%(mono), 0.4%(Stereo) Frequency Response 30Hz - 15,000Hz +0.2dB,-1dB Capture Ratio 1.5dB Alternate Channel Selectivity 65dB Spurious Response Ratio 78dB Image Response Ratio 55dB IF Response Ratio 80dB AM Suppression Ratio 50dB Muting Threshold 14dBf Stereo Separation 32dB (30Hz - 15kHz) Antenna Input 300Ω balanced, 75Ω unbalanced AM Tuner Section Sensitivity 220µV/m (IHF, Ferrite antenna) 11µV (IHF, ext. antenna) Selectivity 25dB Signal-to-Noise Ratio 50dB Image Response Ratio 45dB IF Response Ratio 45dB Antenna Built-in ferrite loopstick antenna Versions/Power Requirements 120 V AC 60Hz 220 V AC 50Hz 240 V AC 50Hz 120/220/240 V AC 50/60Hz Switchable Carefully shipped