Doepfer A-138 Mixer

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$65.00 to $81.00 Price Tier: Budget

4.0 (6)

All time low price

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Page last updated Jul 01, 2026

Pricing and availability

We compare 600+ stores and found this item at 2 stores. Prices updated May 27, 2026.

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Price

$81.00

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4.8 (32)

$65.00

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Average Price: $73

Budget/Beginner

$149

$350+

Price Tier

In the Modular Synthesizers category, Doepfer A-138 Mixer is priced in the Budget/Beginner range. This is great gear to get started with or for creators on a budget.

Budget

Standard

High-end

Price History

Based on price data from 2 merchants for "Doepfer A-138 Mixer". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

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Description

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The Doepfer A-138 Mixer is a versatile and essential component for any modular synth enthusiast. Designed in a compact Eurorack format, this mixer offers an intuitive interface that caters to both audio signals and control voltages, making it a powerful tool for sound engineers and musicians alike. With its 4 channels, each equipped with an independent attenuator, it allows for precise control over your soundscape, ensuring that every nuance of your performance is captured and manipulated to perfection.

Whether you're looking to create complex audio textures or simply need a reliable mixer for your modular setup, the Doepfer A-138 stands out for its simplicity and effectiveness. Its compact 8HP width makes it an easy fit into any existing setup, while its efficient power requirements mean you won't have to worry about overloading your system. This module is not just about functionality, but also about enhancing your creative potential, giving you the freedom to explore new sonic territories.

Key Features:

4 channels for versatile mixing capabilities
Suitable for both control voltages and audio signals
Independent attenuator for each channel
Compact Eurorack format (8HP width)
Power requirements: +10 mA (+12V) / -10 mA (-12V)

Product specs

Available since	June 2007
Modul Type	Mono
Width	8 TE / HP

FAQs

What type of signals is the Doepfer A-138 Mixer suitable for?: The Doepfer A-138 Mixer is designed for mono signals, making it ideal for combining multiple audio sources in a modular synthesizer setup.
Is the Doepfer A-138 Mixer a linear or logarithmic mixer?: The Doepfer A-138a Mixer is a linear mixer, which is typically used for mixing control voltages and audio signals where linear response is desired.
How wide is the Doepfer A-138 Mixer in a Eurorack setup?: The Doepfer A-138 Mixer takes up 8 TE/HP (horizontal pitch) in a Eurorack modular synthesizer system, making it a compact choice for your setup.
Can the Doepfer A-138 Mixer be used for both audio and CV signals?: Yes, the Doepfer A-138 Mixer can handle both audio and control voltage (CV) signals, providing flexibility in your modular synth configurations.
Does the Doepfer A-138 Mixer require any special power supply?: The Doepfer A-138 Mixer is designed to fit into a standard Eurorack system and uses the typical Eurorack power supply. Make sure your system has the appropriate power connections.

Reviews

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PROS

Signal quality is sufficient for most uses
Channel 1 provides a constant CV 0-5V offset when unused
Essential for mixing LFO outputs for modulation
Reliable performance in every patch setup
Provides good value for its price point

CONS

The unique CV offset feature is not immediately obvious to users

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Doepfer A-138 Mixer.

Setup and maintenance

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Replacing chips can resolve noise issues; they are inexpensive, but shipping may cost more unless sourced locally.
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High pitch whine noise may be linked to power supply bleed, potentially affecting audio quality.
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Replacing electrolytic capacitors and inspecting the board for damage can be crucial troubleshooting steps.
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Build quality

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Scratchiness and poor audio quality often stem from the top mix control knob, especially when set past noon or at minimum.
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User experience

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Used units might have been mistreated, such as being powered backwards, which can lead to issues.
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One owner uses the A-138s for both audio and CV, noting its utility as an attenuator/CV mixer despite limited inputs.
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Features and functionality

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The A-138s is appreciated for its simplicity and price, making it a preferred choice over more expensive mixers for basic stereo busses.
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The lack of LED indicators on the A-138s is a common complaint, as users find this feature would enhance usability.
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The A-138s is favored over Roland 531 by users who don't need additional features, focusing on straightforward stereo buss routing.
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