Otari – MX-5050 B III

Product Description

Otari – MX-5050 B III

Features

The MX5050 BIII has long been the standard in 1/4″ two-track analog recorders.

It features an optimized three-head design and transformerless balanced inputs and outputs to provide superior frequency response,

low distortion and high signal-to-noise performance under the most demanding conditions.

Record setup adjustments can be made from the front panel,

and a convenient built-in oscillator provides test tones for calibration/maintenance.

The direct drive capstan motor is servo-controlled, and an integral microprocessor governs tape handling,

including dynamic braking, motion sensing and transport logic.

A built-in mini-autolocator provides three one-touch cue-point memories, search zero, and a repeat function.

The tape timer display shows tape time in Hrs/Min/Sec., as well as tape speed in inches per second and percentage of tape speed.

Capstan speed can be varied by ±20% in 0.01% steps using the built-in “pitch” control.

Timecode editing using a synchronizer is accomplished via the 37-pin Otari standard parallel interface.

The extremely rugged mechanical construction includes a 1/4″ deckplate with cast aluminum side panels and steel support members.

All circuit boards are designed to swing out or unplug for quick service access.

Positive-action transport controls

Balanced transformerless XLR I/Os

DC capstan, Quartz PLL servo-controlled

Built-in mini-autolocator

Built-in test oscillator and external oscillator input

Variable pitch control (±20%)

 

Specifications:

Tape Transport

Track Configuration Tape Width: 1/4 inch
BIII-F (Full Track) = Repro (2T) x 1, Erase (FT) x 1, Rec (FT) x 1, Repro (FT) x 1
BIII-2 (2-Track NAB) = Erase x 1, Rec x 1, Repro x 1
BIII-2E (2-Track DIN) = Erase x 1, Rec x 1, Repro x 1
Motor Capstan x 1 (DC brushless PLL servo motor)
Reel x 2 (AC Induction Motor)
Reel Size max. 10.5 inch NAB
Tape Speed High Speed Version: 15 ips (38.1 cm/s), 7.5 ips (19.05 cm/s)
Low Speed Version: 7.5 ips (19.05 cm/s), 3.75 ips (9.53 cm/s)
Tape Speed Accuracy Within ±0.2%
Tape Speed Deviation Less than 0.2%
Wow & Flutter
(Peak Weighted per DIN 45507)
15 ips (38.1 cm/s): Less than ±0.06%
7.5 ips (19.05 cm/s): Less than ±0.08%
3.75 ips (9.53 cm/s): Less than ±0.12%
Start Time (Time required to accelerate to double the specified W&F value)
15 ips (38.1 cm/s): Less than 0.5 s
7.5 ips (19.05 cm/s): Less than 0.4 s
3.75 ips (9.53 cm/s): Less than 0.3 s
Stop Time (Time to stop from Play mode)
15 ips (38.1 cm/s): Less than 0.5 s
7.5 ips (19.05 cm/s): Less than 0.3 s
3.75 ips (9.53 cm/s): Less than 0.3 s
Time to Stop from Fast Wind: Less than 3 s
Fast Wind Time

(2,500 ft tape)

110 s (@ 50 Hz)
90 s (@ 60 Hz)

Electronics (0 dBu = 0.775 V)

Input Line
Mode: Transformerless active balanced
Input Impedance: 100 kΩ (20 Hz to 20 kHz)
Nominal Inpelut Lev: +4 dBu
Max. Input Level: +30 dBu
Connector: XLR type (female)
Microphone
Mode: Transformerless active balanced
Input Impedance: 10 kΩ
Min. Input Level: -70 dBu/-50 dBu/OFF switchable
Microphone Impedance: 150Ω
Output Line
Mode: Transformerless active balanced
Output Impedance: Less than 5Ω (20 Hz to 20 kHz)
Load Impedance: min. 200Ω
Nominal Output Level: +4 dBu/-16 dBu switchable
Max. Output Level: +26 dBu (200Ω)
Connector: XLR type (male)
Headphone
Load Impedance: 8Ω
Connector: 6-mm stereo phone jack
Equalization NAB/IEC switchable
Standard Reference Flux 185/250/320* nWb/m (*open circuit flux)
Frequency Response REC/REP
15 ips (38.1 cm/s): 30 Hz to 20 kHz ±2 dB
7.5 ips (19.05 cm/s): 30 Hz to 18 kHz ±2 dB
3.75 ips (9.53 cm/s): 20 Hz to 10 kHz ±2 dB
REC/SEL-REP
15 ips (38.1 cm/s): 250 Hz to 7.5 kHz ±3 dB
7.5 ips (19.05 cm/s): 250 Hz to 5 kHz ±3 dB
3.75 ips (9.53 cm/s): 250 Hz to 2.5 kHz ±3 dB
Signal-to-Noise Ratio IEC
15 ips (38.1 cm/s): 70 dB (unwtd), 73 dB (wtd)
7.5 ips (19.05 cm/s): 67 dB (unwtd), 70 dB (wtd)
3.75 ips (9.53 cm/s): 64 dB (unwtd), 67 dB (wtd)
NAB
15 ips (38.1 cm/s): 69 dB (unwtd), 72 dB (wtd)
7.5 ips (19.05 cm/s): 71 dB (unwtd), 73 dB (wtd)
3.75 ips (9.53 cm/s): 64 dB (unwtd), 67 dB (wtd)
unwtd = with RC filter (30 Hz to 18 kHz)
wtd = 1 kHz ref. signal and NAB or ANSI “A” filter
Total Harmonic Distortion 0.3% (15 ips (38.1 cm/s), 1 kHz, 250 nWb/m, AMPEX 456)
Crosstalk Better than 55 dB
Depth of Erasure Better than 75 dB
Test Oscillator Frequency Sine wave 1 kHz/10 kHz
Bias Frequency 133 kHz
Erase Frequency 133 kHz

Miscellaneous

Electric Power 100/110/117/200/220/240 VAC ±10%, single phase 50/60 Hz
Operating Environment Temperature: +5 to +40°C, Relative Humidity: 20 to 80%
Storage Environment Temperature: -20 to +45°C, Relative Humidity: 10 to 80%
Dimensions (WxHxD) 430 x 527 x 275 mm
Weight 28 kg

 

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