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Golden Age Project PREQ-73 Microphone Preamplifier and Equalizer

Dial in airy highs and fat lows with this preamp's 2-band shelf EQ. Built with all discrete electronics, the PREQ-73 lets you shape your sound on the way in. Rate and review this product
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Product Description

The Golden Age PREQ-73 is a one-channel vintage style microphone, line, and instrument preamplifier with a two-band shelving equalizer offering smooth and effective sound-shaping. The signal path uses only discrete components like resistors, capacitors and transistors. The line and microphone input and the line output are transformer-balanced, using three different transformers, each one optimized for its purpose. The fully floating output can drive a level of at least +26 dBu into a load as low as 600 Ohms. This is the way audio components were built before integrated circuits became available. The subjective sound quality delivered by vintage equipment is often preferred over the one delivered by modern units, a situation that is even more obvious now when music is recorded with clean-sounding digital audio equipment.

The circuit used in the PREQ-73 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. The essence of this sound is now available at a surprisingly low cost, making it available to nearly everyone.

Circuit Description

The signal first enters an input transformer -- one for the mic input and another one for the line input. The primary of the mic input transformer has two windings that are either connected in series or in parallel, which results in an input impedance of either 1200 or 300 Ohms. The transformers are followed by two input gain stages. For gains up to 50 dB, only one of them is being used. For gains above 50 dB, the second gain stage is inserted in the signal path. Both gain stages uses only three transistors each. After the gain stages, the signal goes to the equalizer section and then to the output level potentiometer and from there to the output stage. This stage again only uses three transistors, the last one in the chain is a hefty 2N3055 power transistor run in class-A mode, driving the output transformer. All in all, the complete signal chain contains only a maximum of 12 active elements including the three transistors in the eq section. Compare that to the big number of transistors that are usually used in one single integrated circuit!

Features:

- Vintage style electronics. No integrated circuits in the signal path.
- Maximum gain on the mic input is 80 dB, enough to handle passive ribbon mics with quiet sound sources.
- Gain range on the line input: -20 to +10 dB.
- Switchable impedance on the mic input, 1200 or 300 Ohm, will change the tone of many mics.
- Switchable phantom power and phase reverse.
- A high-impedance instrument input for sound modules, electric guitar or bass.
- A two band LF (+/-15 dB) and HF (+/-20 dB) shelving equalizer with two selectable frequencies for each band.
- A simple but effective 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. Will drive almost any load.
- Insert jack (unbalanced, low level) for inserting effect units in the signal path. It can be located before or after the eq section.
- Tantalum capacitors in the signal path.
- The circuit board is prepared for the Carnhill mic and line input transformers.
- Jumper selectable 600 Ohms output termination.
- External high power supply to avoid interaction with the audio circuits and transformers.
- A solid build quality that will last many years of normal use.

zZounds is an authorized dealer of Golden Age products.
Dimensions and Weight in Packaging
Shipping Weight: 7 lbs
Shipping Dimensions: 14 x 13 x 4 in
Golden Age Warranty Golden Age offers a one year warranty on all products.
Customer Reviews
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Need it now but short of cash? All we need is the first payment up front and the rest in easy monthly payments!

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