The Revox PR 99 is a professional reel-to-reel tape recorder that gained popularity in the audio recording industry. It features a compact design, dual-channel capabilities, and a robust build quality aimed at delivering high audio fidelity during recording and playback. The PR 99 comes with a variety of tape speeds, allowing users to select between 7.5 and 15 ips (inches per second), which contributes to flexibility in audio quality and duration. This model supports various reel sizes, accommodating 10.5-inch reels for extended recording times. The machine utilizes a transistor-based electronic design, ensuring minimal tape noise and precise sound reproduction. It is equipped with comprehensive control options, including manual and automatic functions for bias and calibration, enabling users to adjust settings according to different tape formulations. Additionally, the PR 99 features a simple-to-use interface, making it accessible for both amateur and professional users. Its durable construction and serviceability make it suitable for a variety of recording situations, from home studios to broadcast applications.