Country of Manufacture:Japan
Speeds: 3 3/4, 7 1/2, 15
Max Reel Size("): 10.5"
Number of heads: 3
Head Composition: Permalloy
Head Configuration: Stereo - Stacked
# Motors: 3
Voltage(s): 110-120v, 220-240v
Frequency Response:30Hz to 20kHz
Wow and Flutter:±0.06
Sound quality rating:8 / 10
Long-term reliability rating: 8 / 10
The Otari MX-55 series were high-tech/ high-performance quarter-inch tape recorders built on a compact die-cast aluminium alloy deck plates with side frames for maximum ruggedness and mechanical stability.
Two main variants were produced, the MX-55N and MX-55D. “D” indicated a DIN or “butterfly” configuration head, standard in Europe. The “N” variant had a normal parallel track head. A third (less common) type was the MX-55T with a centre time-code track (in conjunction with the N head)
All machines in the series could take any size reel from 3″ an 11.8″ DIN hub and different size reels could be used for supply and take-up.
The front panel pitch control provided ±20% variable speed range in 0.01% increments. The capstan motor speed could also be controlled by an external source for interface with a synchronizer or similar controller.
Tape speed accuracy: within ±0.2% / Tape speed deviation: 0.2% maximum / Pitch control: ±20% continuously variable / Fast wind time: 100 seconds 2,500ft at 60Hz. 110 seconds at 50Hz / Start time: 15ips max 0.5s. 7½ ips max 0.3s. 3¾ ips max 0.2s / Wow & flutter: 15 ips max ±0.06%. 7½ ips max ±0.08%. 3¾ ips max 0.12% / Signal to noise ratio: unweighted with audio filter (30Hz to 18kHz) at specified flux level MX 55N 71dB at 15 ips 1040nWb / m MX 55N 69dB at 7½ .ips 1040nWb / m MX 55N 64dB at 3¾ .ips 740nWb / m MX 55D 72dB at 15 ips 1040nWb / mMX 55D 69dB at 7½ .ips 1040nWb / mMX 55D 65dB at 3¾ .ips 740nWb / m / Crosstalk: MX-55N min 55dB. MX-55D min 50dB / Distortion: max 0.3% at 1kHz, 250 nWb / m, 15 ips / Bias & erase frequency: 150 kHz / Frequency response (±2dB): Overall (0 dB = 250 nWb / m) 15 ips: 30Hz to 20kHz. 7½ ips: 20Hz to 18kHz: 3¾ ips: 20Hz to 10kHz / Inputs: Line: XL type female active balanced 10kΩ impedance, input level +4dBu Mic: XL type female active balanced 10kΩ minimum input level -70dBu / Line output: XL type male active balanced BAL / UNBAL switchable, less than 5kΩ output impedance, +4dBu (0 to +13 dBu adjustable) or -16 dBu (-7 to 20 dBu adj) / Dimensions: 17.3 x 8.75 x 19.2″ (440 x 222 x 488 mm) / Weight: 67 lbs (30 kg) / half-track stereo