Golden Age Project PRE-573 Premier 500 Series 1073-Style Microphone Preamp Bruksanvisning

Golden Age Project mottagare PRE-573 Premier 500 Series 1073-Style Microphone Preamp

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

PRE-573 PREMIER

INTRODUCTION

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

The PRE-573 PREMIER 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 opti-

mized 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 PREMIER 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.

- UK-made Carnhill in- and output transformer. The output is 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 and polystyrene capacitors used in the traditional positions.

- 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.

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

CIRCUIT DESCRIPTION

The signal ﬁrst enters an input transformer.

The primary of the input transformer has

two windings that are either connected in

series or in parallell which results in an

input impedance of either 1200 Ohm or 300

Ohm (in MIC mode).

The transformer are followed by two input

gain stages. For gains up to 40 dB, only one

of them is being used. For gains from 45

dB and up, the second gain stage is inserted in the signal path. Both gain

stages uses only three transistors each.

The signal then goes to the Insert connector with its bypass jumper, to the

output level potentiometer and from there on 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.

So, all in all, the complete signal chain only contains a maximum of nine

active elements. Compare that to the big number of transistors that are usu-

ally used in one single integrated circuit!

USING THE PRE-573 PREMIER

Using a preampliﬁer is not rocket science. Here are some points though to

help you getting the maximum out of the PRE-573 PREMIER:

As a start, mount the module in a 500 series rack unit. There are several

alternatives available from different manufacturers, the PRE-573 PREMIER

should work ﬁne in most of them. Make sure that the rack unit power supply

is turned off when you mount or remove the PRE-573 PREMIER.

MIC / LINE INPUT

Connect your Mic or Line source to the input connector on the 500 rack unit

corresponding to the slot where the PRE-573 PREMIER is placed.

For Microphone sources:

1. Set the MIC - LINE switch in the MIC position.

2. Set the MIC/LINE - ACTIVE DI switch in the MIC/LINE position.

3. Set the PASSIVE DI switch in the downward off position.

4. Engage +48 V if the connected mic needs phantom power. It is good

procedure to always disengage the phantom power and wait for about 10

seconds before unplugging a mic.

The 300 - 1200 switch will select the input impedance. 1200 ohm is the

normal position for most mics. Lowering the mic input impedance to 300

ohm will change the tone of many microphones and will give you one more

soundshaping option.

For Line level sources:

1. Set the MIC - LINE switch in the LINE position.

2. Set the MIC/LINE - ACTIVE DI switch in the MIC/LINE position.

3. Set the PASSIVE DI switch in the downward off position.

The LINE input mode will attenuate the input signal with about 30 dB and

also increase the input impedance to about 10 kohm.

If you want the smallest amount of coloration, always set the OUTPUT LEVEL

potentiometer at or close to maximum, and adjust the output level with the

stepped GAIN switch.

The +10 - 0 - +5 dB switch should normally be in the 0 position but you can

set it to +5 or +10 dB anytime you want to add gain.

The +5 and +10 dB positions of this switch corresponds to the -75 and -80

dB positions (with the PRE-573 PREMIER GAIN switch set to 70 dB) and the

-45 and -50 dB positions (with the PRE-573 PREMIER GAIN switch set to 40

dB ) in the classical 1073 unit.

This setup makes it possible to use both gain stages also for gains of 45 and

50 dB (with the +10 - 0 - +5 switch set to 0) for some added character.

If you want more character, turn the OUTPUT LEVEL potentiometer counter-

clockwise and increase the gain with the GAIN switch. This will drive the

input gain stage(s) harder and provoke more character from them.

DI INSTRUMENT INPUT

Instruments that are not connected to the mains AC power line can be con-

nected to the DI instrument TRS input on the front panel.

The DI input has two selectable modes, Passive and Active. The Active mode

uses a FET-buffer and has an input impedance of about 1,5 Mohm. The

signal is fed through the input transformer and then onwards to the gain

stage(s).

The Passive mode feeds the signal from the TRS jack directly to the gain

stage(s). It has an input impedance of about 100 kohm.

To use Active mode:

1. Set the MIC/LINE - ACTIVE DI switch to the ACTIVE DI position.

2. Set the PASSIVE DI switch in the off position, ie, the downward one.

To use Passive mode:

Set the PASSIVE DI switch in the On position, ie, the upward one.

PLEASE NOTE:

- DO NOT use a higher GAIN than about 70 dB in Passive mode and 50 dB in

Active mode (you can try it if needed but self oscillation might occur).

GAIN might have to be decreased a bit further when Air EQ is engaged to

avoid self oscillation.

- The DI input in Active mode has a much higher sensitivity than in Passive

mode so GAIN must be set lower than in Passive mode for the same output

level. The input impedance is also much higher so the DI input will load the

connected instrument less compared to the DI in Passive mode.

- The tone of most instrument will differ in the two modes giving you several

sound options.

- Some instruments will sound and work better in one of these modes, the

best way of ﬁnding out is to experiment.

- Signal sources connected to the 500 rack input can remain connected

when you use the DI input.

- DO NOT connect equipment to the DI input (unless they have a fully ﬂoat-

ing, transformer balanced output). It is only intended for instruments like

guitars and basses. For all other signal sources, do use the MIC/LINE input

on the 500-rack. The reason is that the internal ground of the module and

hence the DI-input jack IS NOT the same as the 500 rack ground.

OTHER FUNCTIONS

The three position HP1 - OFF - HP2 highpass ﬁlter switch is located close to

the OUTPUT LEVEL control. The HP1 position has a -3dB frequency of about

45 Hz. The HP2 position has a -3dB frequency of about 180 Hz,

The three position AIR - OFF - PHASE switch works like this:

1. The Phase position simply reverses the phase by reversing the wires from

the secondary winding of the output transformer. Reversing the phase of the

signal is useful on a number of occasions, one is phase reversing the the

lower mic on a snare drum to make it sum in phase with the upper mic.

2. In the middle position of the switch, phase is not reversed.

3. Putting the switch in the upper AIR position adds a boost of about 6 dB

centered at about 30 Khz. It will affect the range from about 5 kHz and up.

There is an unbalanced insert connector located at the back of the unit

where you can insert Golden Age Project/Premier 500 Series effect mod-

ules. The operating level is about -18 dBu. To activate the insert, the jumper

located close to the connector must be removed.

The output transformer used in the PRE-573 PREMIER is designed for

having an ideal load of about 600 ohm. The input impedance of most modern

units is 10 kohm or more. The PRE-573 PREMIER has a jumper selectable

600 ohm output termination resistor. The jumper, which is located at the

back of the unit, is connected from factory to set the load to the ideal 600

ohm when modern units are connected after the PRE-573 PREMIER.

Disengaging the termination resistor by removing the TERM jumper will

result in a slightly higher output level. The jumper should always be discon-

nected if an old-style unit with a low input impenace like 600 ohms is con-

nected after the PRE-573 PREMIER.

WARRANTY

The PRE-573 PREMIER is built to last. But as in any electronic device, com-

ponents can break down. If the unit has a problem and will need repair, you

should contact the reseller where you bought the unit.

The warranty period is decided by the Distributor for your country. The

Distributor will support Golden Age Premier resellers and end users with

repairs and spare parts.

REGISTRATION

You are welcome to register your unit at: www.goldenagepremier.com

---------------------------

I would like to thank you for chosing the PRE-573 PREMIER!

I hope it will serve you well and that it will help you in making

many great sounding recordings.

Bo Medin

Handmade high end pro audio for

a lot less than you would expect!

Produktspecifikationer

Varumärke:	Golden Age Project
Kategori:	mottagare
Modell:	PRE-573 Premier 500 Series 1073-Style Microphone Preamp

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