GA Project EQ-81 Quick Manual

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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

Vintage Style Equalizer

EQ-81

INTRODUCTION

Congratulations on choosing the Golden Age Project EQ-81 Equalizer!

The class-AB circuit used in the EQ-81 is similar to the eq section in the classical 1081 module, without the

high and low pass filters.

The sound character 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.

The EQ-81 has stepped frequency controls that offers a wide selection of frequencies from 33 Hz to 15 kHz.

The BASS and TREBLE frequency bands are switchable between shelving and bell and the MID frequency

bands is of the bell type with a switchable Hi Q setting.

The control range is +/- 18dB. All four bands can be set in an off mode.

The EQ-81 is not intended to be used as a standalone EQ. It is designed to be used together with one of the

Golden Age Project models that has an insert jack. It can also be used with some other product that has a low

level (about -18 dBu to -10 dBu) unbalanced insert connector.

Combining one of our PRE-73 units and an EQ-81 and using a UNITE rack kit to mount them together, one will

get a 19-inch 1081-style unit at a low cost and with a great sound!

FEATURES

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

- 4-band with inductor based mid frequency bands

- Stepped frequency selection

- A wide selection of frequencies from 33 Hz to 15 kHz

- Control range up to +/- 18 dB

- Each band has an off mode

- Tantalum capacitors in the signal path

- Designed to be used together with one of our models with an insert jack

- TRS jack for in-and output connection, the nominal working level is around -18 dBu

- Selectable ground lift switch

- External power supply to avoid interaction with the audio circuits

- Great sound that suits most sound sources and genres

- A solid build quality that will last many years of normal use

Page 1
W w w . G o l d e n a g e p r o j e c t . C o m i vintage style equalizer eq-81 introduction congratulations on choosing the golden age project eq-81 equalizer! The class-ab circuit used in the eq-81 is similar to the eq section in the classical 1081 module, without the high and low pass filters. Th...
Page 2: Create Music
W w w . G o l d e n a g e p r o j e c t . C o m ii circuit description the main signal path in the eq-81 con- sists of four gain stages, one for each each frequency band. Each gain stage uses five transitors and a few resis- tors and capacitors. So, the complete signal chain contains a small number ...