500 rack series version of the original Golden Age Project Pre-73. The Pre-573mk2 also has additional features such as a switchable active or passive DI input. The PRE-573 MKII Plus is a one width module for the api 500 format that has the sound and the features that made the PRE-73 so successful and a few additional ones. The Plus unit now comes with the new Carnhill input transformer.
Requires a 500 format rack / PSU to operate.