Vintage Pre ADDAC712 - Audio Preamplifier ADDAC System - Free user manual and instructions

Product Type	Eurorack Synthesizer Module
Model	Vintage Pre ADDAC712
Brand	ADDAC System
Width	8 HP
Depth	30 mm (approx.)
Height	3U (128.5 mm)
Weight	100 g
Power Supply	+12V 50 mA, -12V 50 mA (via Eurorack bus)
Main Functions	Vintage-style preamplifier with gain control, EQ section, and output level
Inputs	1x audio input (3.5 mm jack)
Outputs	1x audio output (3.5 mm jack)
Controls	Gain knob, EQ knobs (bass, mid, treble), output level knob
Safety	Low voltage; handle with care to avoid short circuits; do not exceed power supply ratings
Maintenance	Wipe with a dry, soft cloth; avoid liquid cleaners
Spare Parts & Repairability	Contact ADDAC System for spare parts; module is not user-serviceable
General Information	Designed for use in Eurorack synthesizer systems; provides warm vintage coloration

Frequently Asked Questions - Vintage Pre ADDAC712 ADDAC System

What is the ADDAC712 Vintage Pre?

The ADDAC712 Vintage Pre is a Eurorack module that emulates a classic vintage preamplifier, offering gain, EQ, and output controls for shaping audio signals.

How many HP does the ADDAC712 occupy?

The module is 8 HP wide, fitting standard Eurorack cases.

What power does the ADDAC712 require?

It requires +12V 50 mA and -12V 50 mA from the Eurorack bus.

How do I connect the ADDAC712 to my system?

Connect the supplied ribbon cable to your Eurorack power header, ensuring correct polarity. Then patch audio inputs and outputs via 3.5 mm jack cables.

Can the ADDAC712 be used with line-level signals?

Yes, it can accept both modular and line-level signals, but you may need to adjust gain accordingly.

What kind of EQ does the ADDAC712 have?

It features a 3-band EQ with low, mid, and high frequency controls for tonal shaping.

Is the ADDAC712 safe to use with other modules?

Yes, when properly connected, it is safe. Ensure your power supply can handle the total current draw.

How do I clean the ADDAC712?

Use a dry, lint-free cloth to wipe the front panel. Do not use liquids or sprays.

Can I repair the ADDAC712 myself?

The module is not user-serviceable. For repairs or spare parts, contact ADDAC System directly.

What is the warranty on the ADDAC712?

ADDAC System offers a 2-year warranty against manufacturing defects. Check with your retailer for details.

USER MANUAL Vintage Pre ADDAC712 ADDAC System

ADDAC System

Instruments for Sonic Expression Est.2009

INTRODUCING

ADDAC712

VINTAGE

PREAMP

USER'S GUIDE, REVO1

December.2022

ADDAC

System

From Portugal with Love!

DESCRIPTION

ADDAC712 is a dual channel discrete gain staging amplifier, based on a famous discrete preamp board from the 70's used in some legendary equipment.

What caught our attention was the character of it's clipping and resulting saturation/distortion.

The module can be used with modular signals to add a distortion/fuzz character or as a preamp for an external source such as a line source, keyboard, guitar...

It's also a great side companion for our ADDAC711 Balanced Inputs.

At the top an On/Off [BYPASS] switch routes the signal into the Effect (Up: Active) or to the bottom output gain stage (Down: Bypassed).

The amount of amplification is set by the [GAIN] control, the maximum amount of amplification can be set by the user using the [MAX GAIN] trimmer.

Up to ±5.5v the incoming signal will keep it's integrity, beyond this point saturation will start to increase.

At aprox. ±6v a hard clipping will start to occur, this clipping also has a particular quality that at extreme levels it drifts the audio 0v bias reference, moving it upwards which results are similar to a Gate effect.

In the middle, an x2 opamp based output gain stage with a clipping led, which monitors the clipping at the output, and an [OUTPUT] control to set the output volume.

Having the top and middle gain stages provides flexibility allowing the user to completely distort the signal on the top stage and tame it's output level with the second stage.

At the bottom, Input and Output for both channels (Left input is normalled into Right input).

This module will also be available as a full DIY kit..

Tech Specs:

6HP

4 cm deep

40mA +12V

40mA -12V

ADDAC712

VINTAGE PREAMP SIGNAL FLOW DIAGRAM

graph TD
    A["INPUT 1"] --> B["PREAM GAIN CONTROL"]
    B --> C["BYPASS ON OFF"]
    C --> D["OUTPUT GAIN CONTROL"]
    D --> E["OUTPUT 1"]
    F["INPUT 2"] --> G["PREAM GAIN CONTROL"]
    G --> H["BYPASS ON OFF"]
    H --> I["OUTPUT GAIN CONTROL"]
    I --> J["OUTPUT 2"]
    K["MAXIMUM GAIN CONTROL"] --> B
    L["CLIPPING LED MONITOR"] --> D
    M["CLIPPING LED MONITOR"] --> J

For feedback, comments or problems please contact us at: [e-mail]

CONTROLS DESCRIPTION