Otari MTR-20S

The Otari MTR-20S is a professional analog reel-to-reel tape recorder designed primarily for mastering and high-quality audio production. It belongs to Otari’s MTR series, known for precision tape transport and advanced electronic control systems.

• Tape Width and Tracks: Typically ¼ inch tape, configured as a 2-track stereo or 4-track machine depending on the model variant.

• Tape Speeds: Common speeds include 7½ and 15 inches per second (ips), with some models supporting 3¾ ips; exact speeds can vary by configuration.

• Tape Transport:
  Features a direct-drive capstan motor with quartz PLL servo control for extremely stable tape speed.
  Two fully servoed DC reel motors maintain constant tape tension and precise tape handling.
  Pinch-roller-less direct drive capstan system reduces tape wear and improves reliability.
  Tape speed accuracy better than ±0.1%, with speed deviation within 0.05% over the reel length.
  Wow and flutter measured at approximately ±0.05% to ±0.08% depending on speed (DIN 45507 peak weighted).
  Fast start/stop times (under 1 second at 15 ips).
  Reel sizes supported up to 14 inches diameter with NAB hubs and auto reel size sensing.

• Heads: Plug-in head blocks with independent azimuth adjustment for precise alignment and maintenance.

• Electronics:
  Transformerless active balanced inputs and outputs (XLR connectors), with optional floating transformers.
  Input impedance typically 10 kΩ, output impedance around 5 Ω.
  Reference level at +4 dBu.
  Built-in test oscillator for calibration and maintenance.
  Switchable equalization standards (NAB, IEC, AES).

• Tape Timer and Controls:
  Six-digit LED tape time counter showing hours, minutes, seconds, and tenths of seconds.
  Variable speed pitch control ±20% with 0.01% precision.
  Cue control for variable speed tape winding in both directions.
  Microprocessor-controlled transport logic for precise operation.

• Build and Design:
  Rugged professional construction designed for studio mastering and production environments.
  Easy access to electronics and transport for maintenance.
  Supports return-to-zero and shuttle modes for editing and cueing.