Akai M9

The Akai M9 reel-to-reel tape deck is a mid-high fidelity, solid-state quarter-track stereo recorder produced in Japan from 1967 to 1970. It features the Akai "cross-field" audio head system, where the bias magnetization is performed by a separate bias head distinct from the combined record/playback head, allowing improved signal modulation across the full audio frequency range without interference.

Technical specifications include tape speeds of 1 7/8, 3 3/4, and 7 1/2 inches per second (with an optional 15 ips adaptor), and a maximum reel size of 7 inches. The frequency response ranges from 30 Hz to 23 kHz at 7 1/2 ips, with wow and flutter under 0.10% at that speed. It achieves a signal-to-noise ratio better than 50 dB with distortion below 2%. The amplifier delivers 15 watts per channel to two built-in 4-inch speakers with side sound reflecting flaps, plus outputs for external speakers and headphones.

The deck uses one hysteresis synchronous motor with two speeds and a capstan sleeve for speed changes. It supports low-level high impedance microphone inputs, high-level line inputs, and provides RCA and DIN outputs. Physically, the unit measures approximately 20 x 13.5 x 9.5 inches and weighs about 42 lbs (19 kg). It was also marketed as the Roberts 771X in the U.S., offered in teak wood or vinyl casing with a carrying handle. The M9 introduced solid-state electronics replacing tubes, marking a notable evolution in Akai's tape decks.