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Technical Details

Brand: Otari


Category:Super High Fidelity


Electronics:Solid State


Country of Manufacture:Japan

Tracks:1/2 Rec/PB

Speeds: 3 3/4, 7 1/2, 15

Max Reel Size("): 10.5"

Number of heads: 3

Dimension: 17.3 x 8.75 x 19.2" (440 x 222 x 488 mm)

Head Composition: Permalloy

Head Configuration: Stereo - Stacked

# Motors: 3

Auto Reverse?:No

Voltage(s): 110-120v, 220-240v

Outputs: XLR Balanced

Frequency Response:30Hz to 20kHz. - 15 ips

Wow and Flutter:±0.06

Signal-to-Noise Ratio:71

Sound quality rating:8 / 10

Long-term reliability rating: 8/ 10

Weight: 67 Lbs.

Additional Details


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.
Two main variations 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.

Reel size is selectable for Left and Right reel separately

Digital tape counter reads and hours seconds minutes with a GoTo and 3 separate memory settings

Additional Info

Fast wind time  100 seconds 2,500ft at 60Hz. 110 seconds at 50Hz

Start time  15ips  0.5s.  – 7½ ips  0.3s. –  3¾ ips  0.2s

Frequency response (±2dB):  15 ips: 30Hz to 20kHz. 7½ ips: 20Hz to 18kHz: 3¾ ips: 20Hz to 10kHz

Signal to noise ratio  Unweighted with audio filter (30Hz to 18kHz) at specified flux level

55N 71dB at 15 ips –  69dB at 7½ ips  – 64dB at 3¾ ips

MX 55D  72dB at 15 ips  – 69dB at 7½ ips – 65dB at 3¾ ips

Wow & flutter  15 ips  ±0.06%  7½ ips ±0.08%   3¾ ips  0.12%

Distortion max 0.3% at 1kHz, 250 nWb / m, 15 ips

Bias & erase frequency  150 kHz

Built-in oscillator with test tones of 0,1-1-10 kHz for bias calibration

Tape speed accuracy: within ±0.2% / Tape speed deviation: 0.2% maximum / Pitch control: ±20% continuously variable   / 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

MX-55N-D Service Manual


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