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Doepfer A-138b

Doepfer A-138b

Doepfer A-138b - mixer with logarithmic potentiometers.

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38 customer ratings:

Overall rating
4.7 out of 5 stars
handling
features
sound
quality
5 Stars
28 Customers

28 customers have given this product a 5-star rating.

Of these, 23 customers have written no texts or given their feedback in another language.

read all 5 reviews
4 Stars
9 Customers

9 customers have given this product a 4-star rating.

Of these, 8 customers have written no texts or given their feedback in another language.

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3 Stars
1 Customer

One customer has given this product a 3-star rating.

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Doepfer A-138-B Mixer

Total
handling
features
sound
quality
Blair, 18.11.2013
The A-138b is essentially a 4 into 1 mixer optimised for audio signals rather than control voltages. the 'b' in the name means the the mixer uses logarithmic rather than linear potentiometers.

For me the A-138b is an essential piece of equipment because it enables me to sum the outputs of up to 4 sound sources (for instance VCO's or noise sources) before sending the combined output to my A-108 Low pass filter module.

With one input employed, and with the channel and master levels set to 10, the volume of the output is the same level as the input signal. in other words, this module will not increase the gain of an input, it will only attenuate it.

When using multiple inputs I find I have to reduce the levels of the individual channels quite a lot, otherwise the output from the mixer becomes to much for next module in the chain. So if I am using 3 inputs, I will use a maximum of about 33% of each channel's volume.

The mixer appears to operate very quietly. It does not introduce much 'hiss' into the sound. Some reviewers have found otherwise , so it may be that my ears are not as sensitive as theirs.

I have rated the A-138b as 5 stars except for features, which I have given a 4 for. The reason for this is that the Doepfer website indicates that with no input into channel 1, the channel 1 level will act as a +5 volt DC offset. In other words, the unit *can* increase the level beyond that of an input signal. However, my unit doesn't work like this. As delivered, all 4 inputs on my A-138b work in the same way. The manual says there is a jumper I need to re-position on the rear of the circuit board to achieve the +5 volt DD offset with input level 1. I think this option should have been made available as a toggle switch on the front panel. It would be useful on occasions when I am only using 3 inputs, but I do not want to have to remove the unit from its case and re-position a jumper each time to achieve this!

Overall, another useful and great value unit from Doepfer, in my opinion.
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Does its job!

Total
handling
features
sound
quality
19.01.2017
Very useful 4 into 1 mixer. I've used it to mix VCO waves into the Wasp filter and the A-116 wave processor.
Will be used a LOT.
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Show variations of this product
Doepfer A-138b
(38)
Doepfer A-138b

Doepfer A-138b - mixer with logarithmic potentiometers.

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-110-1
(50)
Doepfer A-110-1

Standard VCO for Modular System A-100Module A-110-1 (VCO) is a voltage controlled oscillator. The A-110-1 produces frequencies in a range of about 8 octaves, of which four waveforms are available...

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-180-2 Multiples
(42)
Doepfer A-180-2 Multiples

Passive Multi-Port Distributor 8x Interconnected jacks, Sockets are divided into 2x quadruple groups; but can also be modified to an eight-multiple (soldering bridge on the circuit board), Width:...

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-124 Wasp Filter SE
(12)
Doepfer A-124 Wasp Filter SE

Wasp Filter Special edition, Black front, Yellow knobs

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-111-2
Doepfer A-111-2

Doepfer A-111-2; High End VCO II / VCLFO; Width: 14 HP, Current: +70mA (+12V) / -50mA (-12V)

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-140
(40)
Doepfer A-140

ADSR Envelope Generator The module A-140 is a envelope generator and since it delivers control voltages, belongs to the modulation-modules. As soon as the ADSR is triggered at gate-input, it...

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-119
(25)
Doepfer A-119

Doepfer A-119 - external input/envelope follower; Width: 8HP / 40.3 mm; Depth: 45 mm (measured from the rear side of the front panel); Current: +30mA (+12V) / -20mA (-12V)

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-180-3 Dual Buffered Multiple
(6)
Doepfer A-180-3 Dual Buffered Multiple

Doepfer A-180-3 Dual Buffered Multiples, dual buffered 1-in-3 multiple to copying/buffering of control and audio signals, Width: 4 TE / 4HP / 20.0 mm

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-132-3
(19)
Doepfer A-132-3

Module Dual linear/exponential, VCA

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
€51 £43.43
Price includes VAT, shipping costs extra

£ price – guideline price only

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This item is in stock and can be dispatched immediately.

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item number 166482
sales unit 1 piece
available since January 2004
Total rating
handling
features
sound
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sales rank
in this category Rank 22
at thomann.de Rank 7797
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