Cassete recorder or prayer cassette recorder or player Operating mode / volts AC power supply / 60 Hz 120 V or 50 Hz 230 volts speaker - For headphones or AF amplifier material Plastic housing (not Bakelite), thermoplastic from Radiomuseum.org Model: Multitrack Cassette Recorder MT4X - Yamaha Co.; Hamamatsu shape Desktop-Large, - Landscape (wider than portrait or square). Dimensions (WHD) 414 x 111 x 311mm / 16.3 x 4.4 x 12.2 inch remark Track configuration: 4 tracks/4 channels one direction Dedicated Tape Type: C-46-90 Chrome Type II (Bias EQ 70 µs) Heads: 4-track Hard Permalloy record/play 4-track ferrite erase Motor: DC servo motor Tape Speed: 9.5 cm/s or 4.8 cm/s with pitch control ±10 % Wow and Flutter: 0.1% WRMS at 9.5 cm/s Frequency response: 20Hz-20kHz +1dB / -3dB net weight 4.4 kg / 9 lb 11.1 oz (9,692 lb)