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Golden Age Project PRE-573 MKII

500 Series 1073 Style Microphone Preamplifier

Golden Age Project PRE-573 MKII

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Product Description for the Golden Age Project PRE-573 MKII

The Golden Age Project PRE-573 is a one width module that has the sound and the features that made the PRE-73 so successful, and a few additional ones. The circuit still uses the preamp and output section from the classic 1073-module, adapted to work in the 500 series rack format. It has a total gain range from -15 to +80 dB. The 10 - 70 dB range is handled by a turn switch and there is a separate toggle switch to select an additional 5 or 10 dB gain. The input can be configured to accept line level signals by another switch, the gain is then lowered by about 25 dB and the input impedance increased to about 15 kohm.

An added feature, using the same circuit as in the PRE-73 DLX, is the active DI-input with a high input impedance of about 1,5 Mohm. The output signal from the active DI circuit passes through the input transformer for some extra character.

The DI-input is very flexible since it can be changed to a purely passive one by a front panel switch. The DI input is then exactly the same as in the PRE-73 Mk2 where the signal is fed directly into the second gain stage, bypassing the transformer and with an input impedance of about 100 kohm. A beneficial feature is the switchable AIR mode that adds a small boost above 10 kHz that peaks at 2 dB at about 35 kHz.

A simple but effective signal and overload indicator is offered by a single LED that starts glowing red at about +4 dBu and then increases its intensity up to the maximum output level. The PRE-573 has a dedicated insert connector at the back allowing it to interface with other GAP 500 modules. The insert can be activated by removing a jumper connector at the back of the module.


  • Vintage Style electronics, no integrated circuits in the signal path
  • Transformer balanced, fully floating output
  • Enough mic gain to handle passive ribbon mics with quiet sound sources
  • Total gain range from -15 to +80 dB
  • Switchable impedance on mic input, 1200 or 300 ohms
  • Switchable phantom power with a LED indicator
  • A flexible front panel instrument input for additional sound sources
  • Make fine gain adjustments and overload the main gain stage(s) for more character
  • Insert jack for inserting Golden Age Project 500 Series effect units
  • Phase switch
  • Selectable AIR equalizer adds a small boost above 10 kHz
  • Tantalum capacitors in the signal path
  • Selectable 600 ohm Output Termination at the back of the module
  • Circuit board star grounding scheme
  • A solid build quality that will last many years of normal use
Brand Golden Age Project
Weight 1.0100
Dimensions (WxHxD) 10 x 9 x 4

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