API 527A 500 Series Discrete Compressor/Limiter #3 en Tallin, Condado de Harju, Estonia

The API 527 joins the family of API VCA-based compressors, alongside the 225L and the 2500 Stereo Bus Compressor. Those familiar with these units will feel right at home with the 527. Like its counterparts, it offers both "feed-forward" (NEW) and "feed-back" (OLD) gain reduction methods, selectable from the front panel. This provides maximum flexibility, allowing users to choose between the traditional "old way" of compression or the more modern approach.
The "feed-back" method, used in most classic compressors, relies on gain control circuits that react to the processed signal. In contrast, the "feed-forward" method, common in newer VCA compressors, utilizes RMS detectors to determine gain reduction.
Features:
- Audio circuit with 2510 and 2520 discrete op-amps and transformer output
- Continuously variable, detented controls for Threshold, Attack, - Release, and Ratio