Pricing and availability

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Average Price: $67

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$149

$350+

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Price History

Based on price data from 3 merchants for "Doepfer A-138o". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

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Description

Unleash the full potential of your Eurorack setup with the Doepfer A-138o, a sophisticated performance mixer output module designed to seamlessly integrate with your modular synth system. Tailored to complement the A-135-4A VC Performance Mixer and the A-138p Performance Mixer modules, the A-138o is your key to achieving pristine stereo audio outputs. This module doesn't just stop at left/right outputs; it also features auxiliary send and return connections, providing you with extensive control over your sound's spatial dynamics. Beautifully compact at just 4HP, this module is both space-efficient and power-smart, ensuring it fits comfortably into your existing rig without compromising on functionality.

Whether you're routing signals through effects or drawing out the subtleties of your mix, the A-138o offers the precision and flexibility required by today's discerning musicians and sound designers. Its intuitive interface and robust construction ensure that it stands up to the rigors of both studio work and live performances.

Join a community of musicians who value quality and versatility; the Doepfer A-138o is not just an addition to your setup—it's an upgrade.

Key Features:

  • Audio output module designed for use with Doepfer's Eurorack performance mixer modules
  • Provides Left/Right audio outputs and Aux Send/Return with level controls
  • Requires at least one A-138p or A-135-4A performance mixer module (sold separately)
  • Compact size: 4HP, 40mm deep
  • Power consumption: 20mA (+12V), 20mA (-12V)

Product specs

Type Audio Output Eurorack Module for Doepfer A-138p/A-135-4A
Controls Main level, Aux Send, Aux Return
Depth 1.57" (40mm)
HP Size 4HP
Power Usage ±12V DC, 20mA
Power Supply Requires Eurorack case and power supply

FAQs

What is the primary function of the Doepfer A-138o module?

The Doepfer A-138o is an audio output module designed to work with the Doepfer A-138p/A-135-4A performance mixers, providing main level control, and auxiliary send and return capabilities for Eurorack systems.

How does the Doepfer A-138o integrate with the A-138p/A-135-4A?

The Doepfer A-138o connects directly to the A-138p/A-135-4A performance mixers, allowing users to control the main output level and manage auxiliary sends and returns, enhancing the overall mixing capabilities of their Eurorack setup.

What are the power requirements for the Doepfer A-138o module?

The Doepfer A-138o requires a Eurorack case and power supply, operating on ±12V DC and consuming 20mA of power.

How much rack space does the Doepfer A-138o occupy?

The Doepfer A-138o takes up 4HP of rack space in a Eurorack setup, making it a compact addition to your modular system.

Can the Doepfer A-138o be used independently of the A-138p/A-135-4A?

No, the Doepfer A-138o is specifically designed to work in conjunction with the A-138p/A-135-4A performance mixers and is not intended for standalone use.

ModularSynth_FR

ModularSynth_FR

#3 Doepfer - Performance mixer A-138p & A-138o (Review en français )

Video thumbnail for #3 Doepfer - Performance mixer A-138p & A-138o  (Review en français ) by ModularSynth_FR

#3 Doepfer - Performance mixer A-138p & A-138o (Review en français )

ModularSynth_FR

ModularSynth_FR

Reviews

PROS

  • Pairs seamlessly with A138p for expanded mixing capabilities

  • Solid build quality ensures durability

  • Transparent sound without coloration

  • Enhances modular systems significantly

  • Doepfer's quality and reliability

CONS

  • Auxiliary in/out is mono, limiting effects integration

  • Lack of information on maximum connectable mixing modules

  • No stereo AUX return, missing out on spatial effects possibilities

Owner Insights

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

Setup and maintenance

  • Doepfer A-138o requires careful attention to power cable orientation; incorrect setup can lead to overheating and potential component damage.

    Source

Mods and upgrades

  • LM13700, TL072, and TL074 ICs in DIP style are recommended spares for repairs, available from vendors like Tayda electronics.

    Source

User experience

  • Users appreciate Doepfer’s use of common ICs in sockets, facilitating easy replacement and maintenance.

    Source

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