Revox A77 Professional

The Revox A77 Professional is a robust, high-precision reel-to-reel tape recorder designed with a professional-grade transport and advanced electronic circuitry. It is built to deliver long-term mechanical stability and excellent audio performance, suitable for demanding professional and semi-professional applications.

Mechanical and Transport Features

• Transport Mechanism:
  Rugged 3-motor tape drive system comprising two reel motors and one electronically regulated capstan motor. The capstan motor is electronically controlled for precise speed stability.

• Chassis:
  Die-cast motor chassis and head support ensure high mechanical precision and long-term stability, even under heavy use.

• Brakes:
  Solenoid-operated servo brakes provide smooth tape handling and fast stopping.

• Tape Speeds:
  Supports 7½ ips (19 cm/s) and 15 ips (38 cm/s) in half-track and full-track configurations.

• Reel Size:
  Accommodates reels up to 10.5 inches (26.5 cm).

• Connectors:
  Balanced inputs and outputs via professional-grade Cannon XLR connectors. Inputs expect +8 dBm for full tape modulation; levels are preset with no front panel adjustments. Outputs provide balanced +8 dBm line level and an adjustable output for headphones or unbalanced equipment.

• Optional Amplifiers:
  Plug-in 8-watt amplifiers are available for half-track machines to drive external speakers or internal speakers in suitcase versions.

Electronics and Audio Performance

• Inputs: Balanced line-level inputs preset at +8 dBm for full modulation.

• Outputs: Balanced line-level outputs at +8 dBm, adjustable headphone/unbalanced outputs.

• Frequency Response: Approximately 30 Hz to 20 kHz at 7½ ips.

• Wow and Flutter: Around 0.08% at 7½ ips.

• Signal-to-Noise Ratio: Approximately 62 dB.

• Total Harmonic Distortion: About 0.6%.

• Crosstalk: Around 45 dB.

• Amplifiers: Modular plug-in amplifier boards facilitate easy servicing.

• Sound Heads: High-quality Revodur magnetic heads designed and manufactured by Studer Revox for improved magnetic characteristics and longer life.

• Calibration: Separate bias and equalization calibration controls for each speed and channel allow precise adjustment, ensuring excellent recording characteristics.

• Power Output: Optional 8 watts per channel amplifiers available.

Physical Specifications

• Dimensions: Approximately 415 x 359 x 180 mm (W x D x H).

• Weight: Around 15 kg (33 lbs).

• Power Consumption: Approximately 70–100 VA.

Additional Notes

• The A77 Professional is recognized for combining the mechanical reliability of a professional tape transport with advanced electronic design.

• It is often used in professional environments due to its balanced inputs/outputs and rugged construction.

• The machine's preset input levels and balanced connections suit studio and broadcast applications.

• Optional accessories include internal speakers and external amplifier modules.