Golden Age Project PREQ-73 Premier Manual

Golden Age Project Modtager PREQ-73 Premier

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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

PREQ-73 PREMIER

INTRODUCTION

Congratulations on choosing the Golden Age Project PREQ-73 PREMIER microphone preampliﬁer and equalizer!

The PREQ-73 PREMIER is a one-channel vintage style microphone-, line- and instrument preampliﬁer with a

three-band band equalizer with inductor based midrange offering a smooth and effective sound shaping. 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 three different transformers, each one optimized for its

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

The circuit used in the PREQ-73 PREMIER is similar to the preamp and the equalizer section in the classical 1073

module with a corresponding sound character that is warm, punchy, sweet and musical. These classic character-

istics 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.

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

- Classic 23-position Gain/Line switch with 5 dB steps and a gain range of 20 to 80 dB for mic and -10 to +20 dB for line.

- A two band LF (+/-15 dB) and HF (+/-20 dB) shelving equalizer with two selectable frequencies for each band.

- Inductor based +/- 15 dB midrange equalizer section with three selectable frequencies. The lowest one is selectable between 350 and 700 Hz.

- Switchable impedance in mic mode, 1200 or 300 Ohm, will change the tone of most mics. The input impedance in line mode is 10 kOhm.

- Switchable phantom power and absolute phase.

- A high-impedance instrument input for any sound module, electric guitar or bass.

- A simple but effective 4-step LED output level meter.

- The output level control makes it possible to make ﬁne gain adjustments and also to overload the main gain stage(s) for more character.

- Separate combo XLR/TRS jack for the MIC and LINE input and separate output XLR and TRS jacks for ﬂexible connections.

- Selectable 600 Ohm output termination.

- Classic style knobs and buttons.

- Prepared for mounting one ot two units in the UNITE PREMIER rack kit. It can also be mounted in one of the other UNITE rack kits and combined with

--the red and black Golden Age Project products.

- Connector free internal wiring, all connections except the ones to the gain switch

are soldered for the purest signal and most longterm stable signal path.

- UK made Carnhill microphone input and line output transformers.

- The pcb is prepared for the Carnhill 9046M line input transformer.

- Polystyrene capacitors in the ampliﬁer circuits.

- Tantalum capacitors in the signal path.

- Beefed up power supply.

- Sturdy toggle switches with gold plated contacts.

- External power supply to avoid interaction with the audio circuits and transformers.

- 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 O J E C T . C O M II

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

Thank you for choosing the PREQ-73 PREMIER!

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

many great sounding recordings.

Bo Medin

- Instruments can be connected to the TS input jack on the front

panel. It has an input impedance of about 100 kOhms. Engage the

DI switch to select this input.

The DI input works in the MIC positions of the LINE/MIC switch. Mic

and Line sources at the back can remain connected while using

the DI input.

- Engage the 48 V phantom power for any mic that needs it. It´s a

good procedure to always disengage the phantom power and wait

for about 10 seconds before unplugging the mic.

- When the LOW-Z switch is engaged, the input impedance of the

input in MIC mode drops from 1200 Ohms to 300 Ohms. This will

change the tone of most mics and will give you one more sound-

shaping option. It will also increase the signal level.

- The phase switch simply reverses the phase by reversing the

wires from the secondary winding of the output transformer.

Reversing the phase of a signal is useful in many situations, one

example is phase reversing the lower mic of a snare drum to make

it sum in phase with the upper mic.

- To activate the equalizer section, engage the EQ switch and select

frequencies with the toggle switches and adjust the level.

- There is an internal jumber just behind the MF frequency switch

that can be set to 350 or 700 Hz, the default from factory is 350 Hz.

- The output transformer used in the PREQ-73 PREMIER is made

for having an ideal load of about 600 Ohm. The input impedance of

most modern units is 10 kOhm or more.

The PREQ-73 PREMIER therefore has a 600 Ohm output termina-

tion resistor that is engaged by the jumper (JP1) located just

behind the XLR output jack. The termination reistor will lower the

ouput level slightly and also affect the upper frequency range,

Remove the jumper if the PREQ-73 PREMIER feed a unit with a 600

Ohm input impedance.

- If the PREQ-73 PREMIER is placed close to another unit with a

power supply, the input transformers and the eq midrange induc-

tor can pick up the electromagnetic ﬁeld that especially mains

transformers generate. If you notice a small hum or any other

noise in the normal noise ﬂoor in a case like this, try moving the

PREQ-73 PREMIER away from other unit and the hum will most

likely disppear.

WARRANTY

The PRE-73 PREMIER is built to last. But as in any electronic

device, components can break down.

There is a 1,0 A, slow blow fuse located inside the unit, close to the

24 V AC input jack. If the unit dies, check this fues. If it has blown,

replace it with a new one.

You can also try another 24 V AC adaptor if you have one available

If this doesn´t help, or if the unit has another problem, it will need

repair and you should then 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 Project resellers and end

users with repairs and spare parts.

REGISTRATION

You are welcome to register your unit at our website:

www.goldenageproject.com

You are also welcome to visit: www.goldenagepremier.com

CIRCUIT DESCRIPTION

The signal ﬁrst enters an input

transformer, one for the mic input and

another one for the line input. The pri-

mary 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 Ohm.

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.

The signal is then fed to the equalizer section if it is engaged and

onwards 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.

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

15 active elements including the six transistors in the eq section.

Compare that to the big number of transistors that are usually

used in one single integrated circuit!

MODERN VERSUS OLD

It is true that there are some great IC´s available today that

achieves very low levels of static and dynamic distortion. The

simple circuits that the PREQ-73 PREMIER uses, and even more so

the transformers, cannot match the low distortion speciﬁcations of

modern IC´s.

It is the distortion components that imparts a sound character to

the audio signal and, if the distortion components are of the right

sort, this is a good thing since it makes the recorded voice or

instrument sound “better”, more musical, more pleasing to the ear.

This is one reason why vintage style units are so popular today.

Modern, transparent sounding audio circuits is surely not a bad

thing, sometimes they are prefered over colored ones. It´s all about

taste and it depends on the genre. For most modern music styles,

color and character is usually a good thing.

USING THE PREQ-73 PREMIER

Using a preampliﬁer and an equalizer is not rocket science. Find

some points below to help you in getting the maximum out of the

PREQ-73 PREMIER:

- Connect the cable from the power supply to the 24 V AC connector

on the back panel of the PREQ-73 PREMIER. Power on the unit with

the POWER switch at the front.

- Connect your mic and/or line sources to one of the input XLR/

TRS combo jacks on the back panel. A mic and a line source can be

connected at the same time,

- Switching between mic and line input is done by setting the LINE/

MIC switch to one of the line or mic gain positions.

- 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 LINE/MIC gain switch.

- If you want more character, turn the OUTPUT level potentio-

meter counterclockwise and increase the gain with the LINE/

MIC switch. This will drive the input gain and the equalizer stages

harder and provoke more character from them.

- For even more character, you can also overdrive the output stage

and the output transformer but you will then need a level control

after the PREQ-73 PREMIER in order to reduce the level to the

appropiate one. This level control can be a passive damping device

(like the Shure A15AS XLR switchable pad) or an input level control

in the unit following the PREQ-73 PREMIER. Vintage character for modern ideas!

Produkt Specifikationer

Mærke:	Golden Age Project
Kategori:	Modtager
Model:	PREQ-73 Premier

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