Doepfer A-138p

$150.00 to $151.00 Price Tier: Standard

All time low price

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Page last updated Jun 07, 2026

Pricing and availability

We compare 600+ stores and found this item at 2 stores. Prices updated June 1, 2026.

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$150.00 3 available New

$159.00 1 available Used

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5.0 (7)

$152.00 $151.00 $1.00 · All time low

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Average Price: $154

Standard/Professional

$149

$350+

Price Tier

In the Modular Synthesizers category, Doepfer A-138p is priced in the Standard/Professional range. This is quality gear at a fair price point, suitable for beginners, hobbyists, and pros alike.

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Standard

High-end

Price History

Based on price data from 1 merchant for "Doepfer A-138p". Prices shown reflect NEW condition. Tracking began Apr 7, 2026.

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Description

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Unlock your creative potential with the Doepfer A-138p, a robust performance mixer designed to elevate your modular synthesizer setup. This 4-way input module is tailored for musicians who crave precision in their live performances and studio sessions. Each channel is equipped with intuitive control knobs for gain, output volume, pan, and AUX, alongside a convenient mute switch and level LED. This ensures smooth and efficient management of your audio signals, allowing you to shape your sound with confidence.

The A-138p is not just about control; it’s about expansion. It seamlessly integrates with other input modules through cascading, giving you the flexibility to build a complex and dynamic sound environment. However, it's important to note that the A-138p requires the A-138o module for operation, making it part of a comprehensive system that offers unparalleled performance.

Perfectly sized at 16 HP and a depth of 40 mm, this module fits effortlessly into your modular rig without demanding extra power (0 mA). Whether you’re a seasoned synth wizard or a modular newcomer, the Doepfer A-138p delivers a blend of simplicity and sophistication that makes it a staple in any setup.

Key Features:

4-way input module with individual control knobs for gain, output volume, pan, and AUX
Convenient mute switch and level LED per channel
Cascading capability for expanded inputs
Requires A-138o module for operation
Compact size: 16 HP width and 40 mm depth
No additional power requirements (0 mA)

Product specs

Available since	October 2016
Modul Type	Stereo
Width	16 TE / HP

FAQs

What is the primary function of the Doepfer A-138p in a modular synthesizer setup?: The Doepfer A-138p serves as a stereo mixer module in a modular synthesizer setup, allowing you to blend multiple audio signals into a single stereo output.
How wide is the Doepfer A-138p, and will it fit in my Eurorack case?: The Doepfer A-138p is 16 TE/HP wide, making it compatible with most standard Eurorack cases.
Is the Doepfer A-138p suitable for stereo mixing applications?: Yes, the Doepfer A-138p is specifically designed for stereo mixing, allowing you to mix multiple audio signals into a stereo output.
Can the Doepfer A-138p be used for both audio and CV mixing?: The Doepfer A-138p is primarily designed for audio mixing, focusing on stereo audio signals rather than control voltage (CV) mixing.

Videos

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Analogue Zone Showroom / Synths and Studio

SUPERBOOTH16 Introducing The New Doepfer A 111-2 A 111-3 A-184-2 And A 138p Performance Mixer

Analogue Zone Showroom / Synths and Studio

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

ModularSynth_FR

Reviews

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PROS

Compact design saves desk space
No power draw, integrates well into setups
Expandable with multiple modules
Passive operation, no external power needed
Quality build at a competitive price
Useful on/off switches for quick source muting
Gain controls enhance level adjustment range
Low noise operation, no hum
Eco-friendly packaging with less plastic
Simple functionality, easy to understand

CONS

Lacks built-in panning capabilities
Must decide on pre or post-fader aux configuration during setup

Owner Insights

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

Setup and maintenance

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The Doepfer A-138p doesn't require power; the A-138o does, and incorrect power connections can damage components like the IC.
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It's crucial to correctly identify the A-138p's 2x5 pin connector, intended for series connections, not power, to avoid installation errors.
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Owners report that TL074CN ICs on the A-138o can be easily replaced if damaged.
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Damaged capacitors like the 10μF on the power board can be identified by visual inspection and need replacement.
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Incorrect IC installation can fry sacrificial resistors, necessitating careful checking during setups.
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Mods and upgrades

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Replacing a damaged IC on the A-138o is feasible; the LM13700 in DIP form is commonly used and available from vendors like Tayda Electronics.
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User experience

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The A-138o's IC can overheat if the power connection is reversed, indicating potential damage that may require chip replacement.
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Users express frustration with Doepfer's lack of clear red stripe markers for power connections, leading to installation errors.
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