Doepfer A-138b Vintage Edition

Modul Type	Mono
Width	8 TE / HP

Modul Type

Mono

Width

8 TE / HP

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Doepfer A-138-B Mixer

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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18 Customer Ratings:

5

14 Customers

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

Of these, 10 customers have written no texts or given their feedback in another language.
4

4 Customers

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

Of these, 3 customers have written no texts or given their feedback in another language.
3
2
1

4.8 / 5.0

handling
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14 written ratings Read all reviews

classic!

Murat1948, 04.06.2018

really nice mixer from doepfer!

	29% bought this exact product Doepfer A-138b Vintage Edition Available immediately Available immediately This item is in stock and can be dispatched immediately. Standard Delivery Times	70 € Add to Basket
	17% bought Doepfer A-138s Mini Stereo Mixer	75 €
	8% bought Erica Synths Pico A MIX	60 €
	7% bought Doepfer A-138a Vintage Edition	66 €
	7% bought Doepfer A-138b	55 €
Our most popular Mixer, Attenuator Modules

sales rank in this product group	33
at thomann.de	45237

item number	383631
sales unit	1 piece
available since	April 2016

Doepfer A-138b Vintage Edition

Mixer Module

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Doepfer A-138b Vintage Edition

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