The Golden Age Project PREQ-73 1-Channel Preamplifier is a vintage-style microphone, line, and instrument preamplifier with a 2-band shelving equalizer for sound shaping in studio recording applications. The signal path uses only vintage-style discrete components such as resistors, tantalum capacitors, and transistors without any integrated circuits. The line input, microphone input, and line output are transformer balanced, with 3 different transformers, each optimized for its specific purpose including Carnhill mic and line input transformers. The fully floating output can drive a level of at least 26 dBu into a load as low as 600 Ohms by configuring an output jumper.
The maximum gain on the microphone input is 80 dB, which is sufficient to handle passive ribbon microphones with quiet sound sources. The impedance of the microphone input can be switched from 1200 to 300 Ohms to accommodate the tonality of different microphones. Phantom power and polarity reverse can also be switched on or off. For line inputs the gain range is from -20 to +10 dB.
A 2-band LF (±15 dB) and HF(±20 dB) shelving equalizer offers 2 selectable frequencies for each band. Metering is provided by a 3-step output level meter and combination XLR/TRS I/O connectors allow for a wide variety of connections. An insert jack enables the insertion of effect units into the signal path.
The circuit used in the PREQ-73 preamplifier is similar to the preamp and part of the equalizer section in the classic 1073 module with a corresponding sound character that is warm, punchy, sweet, and musical. These classic characteristics have been heard on countless recordings through the years and it is a versatile sound that works very well on most sound sources and in most genres. An external high power supply helps reduce interaction with the audio circuitry and transformers.
Vintage-style electronic components
No integrated circuits in the signal path
Maximum 80 dB gain on mic input is sufficient to handle passive ribbon mics with quiet sound sources
Switchable impedance on the mic input (1,200 or 300 Ohms) changes the tone of many microphones
Phantom power and phase reverse switches
High-impedance instrument provides input for sound modules, electric guitar, or bass
A 2-band LF (±15 dB) and HF (±20 dB) shelving equalizer provides 2 selectable frequencies for each band
3-step LED output level meter
Output level control for fine gain adjustments and to make it possible to drive the input gain and equalizer stages harder
Combo XLR/TRS input jacks and separate output XLR and TRS jacks for flexible connections
Insert jack (unbalanced, low level) for inserting effect units in the signal path. It can be located before or after the EQ section
Carnhill mic and line input transformers
Jumper selectable 600Ω output termination
External high power supply helps avoid interaction with the audio circuits and transformers