Doepfer A-138b

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Doepfer A-138b

Doepfer

A-138b

4.9 Expert Rating

Product Info

Article Number: 166482
Brand: Doepfer
Model: A-138b
Price: $64.90

* Prices may vary. Check retailer for current pricing and availability.

The A-138b is a straightforward, no-frills mixer that's perfect for anyone just starting out with modular synthesis or needing a simple audio summing solution. Its logarithmic potentiometers make it a breeze to manage levels, and the small size is a huge bonus in cramped racks. It's a workhorse module for basic signal blending.

Product Description

Doepfer A-138b, Mixer with Logarithmic Potentiometers, Primarily suitable for audio signals, Width: 8 HP, Depth: 35 mm, Power requirements: +10 mA (+12 V) / -10 mA (-12 V)

PROS
  • • Log pots offer smooth, predictable gain staging.
  • • Compact 8HP footprint maximizes modular space.
  • • Robust Doepfer build quality ensures long-term reliability.
  • • Simple, clean design minimizes complexity for beginners.
CONS
  • • Limited to two input channels; lacks more advanced routing.
  • • Logarithmic pots can be less flexible for certain modulation tasks.
  • • Power draw, while modest, adds up in larger systems.

Product Video

Key Features

Channels 2
Type Mixer with Logarithmic Potentiometers
HP Width 8
Depth 35 mm
Power Draw +10 mA (+12 V) / -10 mA (-12 V)
Connections 6 x 1/8" (3.5mm) TS

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Frequently Asked Questions

While logarithmic, they're reasonably linear for basic VCA duties, but dedicated VCA modules offer far better control and range.
Being an older design, it's a bit noisier than some newer modules, but perfectly acceptable for most synth applications – especially when gains are managed carefully.
It's primarily designed for audio signals; using it for CV mixing is possible but not recommended as the logarithmic taper isn't ideal for precise voltage control.

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