GA Project EQ-73 User 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-73

INTRODUCTION

Congratulations on choosing the Golden Age Project EQ-73 Equalizer!

The class-A circuit used in the EQ-73 is similar to the eq section in the classical 1073 module, without the

high pass filter. Additional frequencies have been added and the mid frequency band uses two inductors, the

higher value of the second one is used for the two lowest frequencies, 160 Hz and 240 Hz, to achieve a suit-

able response.

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-73 has stepped frequency controls that offers a wide selection of frequencies from 20 Hz to 24 kHz.

The Low and High frequency bands are shelving and the mid frequency band is of the bell type.

The control range is +/-15 dB for the two lower bands and +/- 18dB for the high frequency band.

There are separate bypass switches for all three bands.

The EQ-73 cannot be used as a standalone EQ. It is made to be used together with one of our PRE-73 models

that has an Insert jack.

Combining a PRE-73 and an EQ-73, and using a UNITE rack kit to mount them together, one will get a 19-inch

1073-style unit at a low cost and with a great sound!

FEATURES

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

- 3-band with a dual inductor based mid frequency band

- Stepped frequency selection

- A wide selection of frequencies from 20 Hz to 24 kHz

- Control range up to +/- 18 dB

- Separate Bypass switches for each band

- Tantalum capacitors in the signal path

- Made to be used together with one of our PRE-73 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-73 introduction congratulations on choosing the golden age project eq-73 equalizer! The class-a circuit used in the eq-73 is similar to the eq section in the classical 1073 module, without the high pass filter. Additional f...
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-73 con- sists of two gain stages that uses three transitors each and a few resistors and capacitors. So, all in all, the complete signal chain only contains six active ele- ments. Compare that to th...