Category:Mid High Fidelity
Country of Manufacture:Japan
Release dates:1967 - 1970
Speeds: 1 7/8, 3 3/4, 7 1/2
Max Reel Size("): 7"
Number of heads: 3
Dimension: 20 x 13½ × 9½" - 508 × 340 × 240 mm
Head Composition: Permalloy
Head Configuration: Stereo
# Motors: 1
Voltage(s): 110-120v, 220-240v
Outputs: RCA, DIN
Frequency Response:7½ ips: 30 - 23kHz +- 3dB
Wow and Flutter:< 0.10 % at 7½ ips, < 0.13 % at 3¾ ips, < 0.203 % at 1 ips
Signal-to-Noise Ratio:better than 50dB
Sound quality rating:6 / 10
Long-term reliability rating: 6 / 10
Weight: 41.8 lbs (19 kg)
The M-9 has three heads, but they are not the usual three. It features an erase head, a cross-field head for improved fidelity of high frequencies, and a combined play/record head. Like all single motor Akai’s, the speed change was handled in an unorthodox manner: the motor ran at two speeds (the little switch on top between the reels) and the third (and optional fourth) speed was achieved by fitting a capstan sleeve. The playback equalisation was changed via a little switch.
The machine has two built-in speakers and the two “flaps” on the side are a kind of sound reflecting device that was often used on Japanese tape recorders of this era.
Also sold as the Roberts 771X in the USA. The cabinet came in two versions: teakwood or vinyl with a carrying handle on it.
Semiconductors: 20 transistors, 4 thermistors, 4 rectifiers / Rewind speed: 90 seconds for 1,200 ft reel / Audio output power: 15 watts per channel undistorted / Inputs: low level high impedance mic input, high level line input / Outputs: line, headphones, external speakers / Speaker(s): 2 x 4″ side mounted with deflector flaps / Dimensions: 20 x 13½ x 9½” (508 x 340 x 240 mm) / Weight: 41.8 lbs (19 kg) / quarter-track stereo
Din and 1/4″ Phono Inputs/Outputs