The A&D GX-Z7100 is a high-end Japanese cassette deck from the late 1980s, created as part of a joint venture between Akai and Diatone (Mitsubishi). This model is the Japanese equivalent of the Akai GX-75 MKII Evolution and is renowned for its use of wear-resistant Super GX glass-ferrite heads. Key Specifications According to Reverb and Facebook Marketplace, the device features the following specifications: Type: Three-head compact cassette deck. Head system: 1 recording head, 1 playback head (Super GX), and 1 erase head. Drive mechanism (LPM): Dual-capstan mechanism. Motors: Quartz-locked direct-drive motor (PLL quartz DD) and 2 DC motors. Frequency response (metal tape): 15 Hz to 23 kHz (±3 dB). Signal-to-noise ratio: 59 dB (without noise reduction); up to 79 dB with Dolby C enabled. Wow and flutter: 0.025% (WRMS). Total harmonic distortion (THD): 0.5%. Features Noise reduction: Dolby B, C, and the Dolby HX Pro dynamic bias system. Calibration: Manual adjustment of bias current (BIAS) and recording level using a built-in signal generator (400 Hz and 16 kHz). Display: Fluorescent (FL) level meter with peak indication and noise reduction status. Additional features: Automatic tape type detection, real-time counter, and program search (IPSS) for up to 16 tracks. Specifications and power supply Dimensions: 425 (451 with side panels) x 154 x 350 mm. Weight: 9.2–9.7 kg (depending on the model and the presence of side panels). Power supply: 100 V (Japanese standard), power consumption 17–22 W.