Otari BTR-10J

The Otari BTR-10J is a professional ¼-inch analog reel-to-reel tape recorder designed primarily for broadcast and studio use, based on the Otari MTR-10 master recorders but enhanced with features tailored to broadcasting needs.

• Tape Width and Track Configuration:
  ¼ inch (6.3 mm) tape width
  Half-track stereo record and reproduce (BTR-10J-2S model)
  Full-track monaural record and reproduce (BTR-10J-FS model)
  Optional mono/stereo switching on some models (BTR-10J-2SZ)

• Tape Speeds:
  30 ips (76 cm/s)
  15 ips (38 cm/s)
  7.5 ips (19 cm/s)

• Tape Transport:
  Precision aluminum cast deck plate
  Quartz PLL servo brushless DC direct-drive capstan motor
  Brush-type DC reel motors with microprocessor-controlled transport and reel servo
  Reel size compatibility: 5", 7", and 10.5" NAB/EIA reels
  Automatic fast wind end slowdown
  Fast start time (max 0.3 seconds at 15 and 7.5 ips) and stop time (max 0.5 seconds)
  Fast wind time max 100 seconds for 2500 ft tape, including slowdown
  Tape timer accuracy within 2 seconds over 30 minutes of play

• Heads:
  Record heads: Hard permalloy (2.75 mm track width for stereo model)
  Playback heads: Hard permalloy (2.1 mm track width for stereo model)
  Erase heads: Ferrite, stagger full-track type

• Electronics and Audio Performance:
  Transformerless active balanced line input and output (XLR connectors)
  Input impedance switchable between 600 Ω and 10 kΩ
  Output impedance max 50 Ω (20 Hz to 20 kHz)
  Input/output levels switchable between +4 dBu and -20 dBu
  Equalization switchable between NAB-J and NAB
  Bias frequency: 250 kHz
  Frequency response:
  30 ips: 20 Hz to 20 kHz ±2 dB
  15 ips: 20 Hz to 20 kHz ±2 dB
  7.5 ips: 20 Hz to 18 kHz ±2 dB
  Signal-to-noise ratio:
  15 ips: 59 dB (NAB-J), 57 dB (NAB)
  7.5 ips: 59 dB (NAB-J and NAB)
  Total harmonic distortion: Max 0.5% at 1 kHz, 250 nWb/m, 15 ips
  Crosstalk: Minimum 55 dB at 1 kHz

• Additional Features:
  Gapless recording
  SEL-REP (Selective Reproduce) for overdubbing and monitor standby
  Punch in and punch out recording
  Mono/stereo switching on some models
  Built-in monitor speakers and independent line/monitor output control
  Line output key switch
  Modular electronics for easy maintenance and serviceability
  Optional floating transformers for inputs and outputs

• Physical and Power:
  Dimensions: Approximately 634 mm (W) x 730-759 mm (D) x 1015-1040 mm (H)
  Weight: Approx. 90 kg
  Power requirements: 100/117/200/220/240 V AC ±10%, 50/60 Hz
  Power consumption: 150 W
  Operating environment: 5 to 40°C, 20 to 80% relative humidity