Golden Age Project PRE-573 MKIII Manual

Golden Age Project Modtager PRE-573 MKIII

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W W W . G O L D E N A G E P R O J E C T . C O M I

PRE-573 MKIII

INTRODUCTION

Congratulations on choosing the Golden Age Project PRE-573 MKIII microphone preampliﬁer!

The PRE-573 MKIII is a one-channel vintage style microphone, line and instrument preampliﬁer. The signal

path uses only discrete components like resistors, capacitors and transistors. The microphone and line input

and the line output are transformer balanced, using two different transformers, each one optimized for its

purpose.

This is the way audio components were built before integrated circuits became available. The subjective

sound quality delivered by vintage equipment is often prefered to the one delivered by modern units, a situa-

tion that is even more obvious now when music is recorded with clean sounding digital audio equipment.

The circuit used in the PRE-573 MKIII is similar to the preamp section in the classical 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.

FEATURES

- Vintage Style electronics. No integrated circuits in the signal path.

- The output is transformer balanced and fully ﬂoating and can drive a 600 ohm load up to level of about

28 dBu.

- Maximum gain in MIC mode is 80 dB, enough to handle passive ribbon mics with quiet sound sources.

- The total gain range goes from -10 to +80 dB. The 20 to 70 dB range (in MIC mode) is handled by a turn

switch and a toggle switch selects an additional 5 or 10 dB gain.

- Switchable impedance on the mic input, 1200 or 300 ohms, will change the tone of many mics.

- The input can be conﬁgured to accept line level signals by another switch, the level is then lowered by

about 30 dB and the input impedance increased to about 10 kohm.

- A selectable two-position 6 dB / octave highpass ﬁlter with fres of about 45 or 180 Hz.

- A ﬂexible front panel instrument input for electric guitar or bass that can be switched between a high

impedance active or a mid-Z passive mode. These two DI-options makes it possible to get different tones

from instruments. Mains connected sound modules or other signal sources should be connected to the MIC/

LINE input of the 500-rack, unless they have a fully ﬂoating, transformer balanced output stage.

- The output level control makes it possible to make ﬁne gain adjustments and also to overload the main

gain stage(s) for more character and then lower the signal to a suitable level before the output stage.

- Insert jack for inserting Golden Age Project and Premier 500 Series eq and effect units. The insert is acti-

vated by removing a jumper at the back of the module.

- A soft start circuit that ramps up the supply voltage slowly (~10 sec.) to avoid a power-on current surge.

- Phase switch and switchable phantom power with a LED indicator.

- Selectable AIR equalizer adds a boost of about 6 dB centered at 30 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.

- Tantalum capacitors in the signal path.

- The 6.8 kohm phantom power resistors are matched to within 0.1% to maintain good common-mode rejec-

tion in the circuit.

- 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.

Produkt Specifikationer

Mærke:	Golden Age Project
Kategori:	Modtager
Model:	PRE-573 MKIII

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