Ampex ATR 100

The Ampex ATR-100 is a renowned professional multitrack reel-to-reel tape recorder introduced in 1976, designed specifically for the ultra high-end studio market, including stereo and quadraphonic 2 or 4 track mixdown and mastering applications.

Key Technical Features:

• Tape Width and Tracks: Uses 1/4-inch or 1/2-inch wide magnetic tape, with configurable 2 or 4 track operation via interchangeable headblock design.

• Tape Speeds: Four standard record/playback speeds selectable in pairs—3.75, 7.5, 15, and 30 inches per second (ips).

• Transport: Unique direct-drive capstan without a pinch roller, servo-controlled tape movement with concurrent reel servo tension control for constant tape speed and tension, resulting in superb wow and flutter specifications.

• Distortion: Third harmonic distortion below 0.3% and intermodulation distortion below 0.1% at typical recorded levels, with signal-to-noise ratios exceeding 80 dB at 30 ips.

• Equalization: Supports both NAB and IEC equalization standards, selectable electronically.

• Head Technology: Ferrite heads and fluxgate head design for excellent frequency response and long life.

• Editing Features: PURC (Pick-Up Recording Capability) for perfect timing of edits to eliminate overlap or gaps; electronic tape timer with high precision.

• Construction: Modular design with easily removable head block, ceramic tape guides, and dynamic braking to protect tapes.

• Physical: Flexible mounting options including bench, pedestal, rack mount, and portable cases.

• Controls: Optional remote control with cable; capstan speed adjustable via variable speed oscillator (VS-IO) option up to 250% of nominal speed.

Performance:

• Frequency Response: Typically covers 100 Hz to 15 kHz and beyond at higher tape speeds with minimal phase distortion.

• Wow and Flutter: The servo-controlled transport maintains tape speed with a maximum 0.02% variation over a 2400-foot reel.

• Tape Handling: Positive and gentle tape motion with constant tension control, dynamic braking prevents tape damage on power failure.

• Versatility: Can handle any reel size from 2 inches up to 14 inches without adjustment due to servo-controlled tension system.

The Ampex ATR-100 is widely regarded as one of the most accurate analog tape recorders ever produced, with exceptional wow and flutter, low distortion, and high signal-to-noise ratio. Its innovative servo-controlled tape transport and modular design make it extremely versatile and serviceable. It remains a legend in professional audio studios for mastering and mixdown applications, offering precision tape handling, durability, and superb audio quality.​

This model represents a pinnacle in analog reel-to-reel tape technology, combining advanced engineering and reliability designed to meet the highest demands of professional audio production.