The PRE-573 MKIII is a one-width module for the api 500 format that has the sound and features that made the PRE-73 so successful and a few more extras.
The circuit still uses the preamp and output section of the classic 1073 module, adapted to operate in the api rack format. It has a total gain range of -10 to +80 dB. The 20-70dB range is managed by a rotary switch and there is a separate toggle switch to select an additional 5dB or 10dB of gain. The input can be configured to accept line level signals by another switch, the gain is then lowered by about 30 dB and the input impedance increased to about 10 kohms.
The mic input mode input impedance can be switched between 1200 and 300 ohms. Phantom power and phase inversion are also selectable by front panel switches. An additional feature, using the same circuit as in the PRE-73 DLX, is the active DI input with a high input impedance of around 1.5 Mohm. The output signal from the active DI circuit passes through the input transformer for additional character.
Features: - 500 format preamplifier module - Golden Age Project PRE-73 MK3 version - Gain range: -15 to +80 dB - Microphone input impedance switchable between 1200 and 300 Ohm - Switchable 48V phantom power - Switch for phase inversion - 2-stage high-pass filter - Switchable AIR mode - Passive/active switchable DI input - Format: 500 series rack module
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