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Mixer: A-138a or A-138b ?

2017-02-26 by Diego Ragnini

I am aware that it likely is an abused subject but sincerely wasn't able to find the answer in the mailing list database. 

For room availability in the rack, I have to choose between one of the two. The most frequent use would be for audio (to mix multiplied signals and then send the output to stomp boxes via A-138d) though it might be adopted to mix control voltages sometimes.

As far as I can see, the “a” might be also used for audio mixing... didn't get if the “b” would work with voltages as well.

In other words, which is the more versatile?

Best, 
Diego

Re: [Doepfer_a100] Mixer: A-138a or A-138b ?

2017-02-26 by Jacco Ville

Hello Diego, 

I have multiple A138's running , most of them the A version. 
Linear A  will match best for both audio and cv. 

Best regards 

Jacco Ville

Sent from my IPhone.

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> Op 26 feb. 2017 om 11:43 heeft Diego Ragnini diegora@free.fr [Doepfer_a100] <Doepfer_a100@yahoogroups.com> het volgende geschreven:
> 
> I am aware that it likely is an abused subject but sincerely wasn't able to find the answer in the mailing list database. 
> 
> For room availability in the rack, I have to choose between one of the two. The most frequent use would be for audio (to mix multiplied signals and then send the output to stomp boxes via A-138d) though it might be adopted to mix control voltages sometimes.
> 
> As far as I can see, the “a” might be also used for audio mixing... didn't get if the “b” would work with voltages as well.
> 
> In other words, which is the more versatile?
> 
> Best, 
> Diego
> 
> ------------------------------------
> 
> ------------------------------------
> 
> 
> ------------------------------------
> 
> Yahoo Groups Links
> 
> 
>

Re: [Doepfer_a100] Mixer: A-138a or A-138b ?

2017-02-26 by Diego Ragnini

Thanks a lot Jacco!

Il giorno 26/feb/2017, alle ore 12:11, Jacco Ville jaccoville@yahoo.com [Doepfer_a100] <Doepfer_a100@yahoogroups.com> ha scritto:

Hello Diego,

I have multiple A138's running , most of them the A version.
Linear A will match best for both audio and cv.

Best regards

Jacco Ville

Sent from my IPhone.

> Op 26 feb. 2017 om 11:43 heeft Diego Ragnini diegora@free.fr [Doepfer_a100] <Doepfer_a100@yahoogroups.com> het volgende geschreven:
>
> I am aware that it likely is an abused subject but sincerely wasn't able to find the answer in the mailing list database.
>
> For room availability in the rack, I have to choose between one of the two. The most frequent use would be for audio (to mix multiplied signals and then send the output to stomp boxes via A-138d) though it might be adopted to mix control voltages sometimes.
>
> As far as I can see, the “a” might be also used for audio mixing... didn't get if the “b” would work with voltages as well.
>
> In other words, which is the more versatile?
>
> Best,
> Diego
>
> ------------------------------------
>
> ------------------------------------
>
>
> ------------------------------------
>
> Yahoo Groups Links
>
>
>

Re: [Doepfer_a100] Mixer: A-138a or A-138b ?

2017-02-26 by james.husted@mac.com

Both the A and B versions will work for both audio and control voltage uses, the only difference will be in how the knobs “feel” when you turn them. The A has Audio Taper pots which make audio sound louder in a more familiar way as you turn the pots, the Linear Taper pots in the B versions will not get louder in the same way, with the same turning distances for instance, but will still mix audio signals. If you mix by ear and not knob positions, there won’t be any difference between them. The A version is not Audio Coupled (having caps in the audio line to stop DC), at least mine don’t and I don’t even know which ones I’m using when I use them. 

Oh, and they both have the normalized DC voltage on input #1, allowing a DC offset voltage to be added to the mix if #1 does not have a cable plugged into it. At least the ones made after 2004 anyway.
-James
James Husted, Designer, Synthwerks LLC • www.synthwerks.com • james@synthwerks.com • info@synthwerks.com

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> On Feb 26, 2017, at 2:43 AM, Diego Ragnini diegora@free.fr [Doepfer_a100] <Doepfer_a100@yahoogroups.com> wrote:
> 
> I am aware that it likely is an abused subject but sincerely wasn't able to find the answer in the mailing list database. 
> 
> For room availability in the rack, I have to choose between one of the two. The most frequent use would be for audio (to mix multiplied signals and then send the output to stomp boxes via A-138d) though it might be adopted to mix control voltages sometimes.
> 
> As far as I can see, the “a” might be also used for audio mixing... didn't get if the “b” would work with voltages as well.
> 
> In other words, which is the more versatile?
> 
> Best, 
> Diego
> 
> ------------------------------------
> 
> ------------------------------------
> 
> 
> ------------------------------------
> 
> Yahoo Groups Links
> 
> 
>

Re: [Doepfer_a100] Mixer: A-138a or A-138b ?

2017-02-27 by christian ienni

"A"s are linear, "B"s are exponential  ;-)

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      From: "james.husted@mac.com [Doepfer_a100]" <Doepfer_a100@yahoogroups.com>
 To: Doepfer_a100@yahoogroups.com 
 Sent: Sunday, February 26, 2017 11:34 AM
 Subject: Re: [Doepfer_a100] Mixer: A-138a or A-138b ?
   
    Both the A and B versions will work for both audio and control voltage uses, the only difference will be in how the knobs “feel” when you turn them. The A has Audio Taper pots which make audio sound louder in a more familiar way as you turn the pots, the Linear Taper pots in the B versions will not get louder in the same way, with the same turning distances for instance, but will still mix audio signals. If you mix by ear and not knob positions, there won’t be any difference between them. The A version is not Audio Coupled (having caps in the audio line to stop DC), at least mine don’t and I don’t even know which ones I’m using when I use them. 

Oh, and they both have the normalized DC voltage on input #1, allowing a DC offset voltage to be added to the mix if #1 does not have a cable plugged into it. At least the ones made after 2004 anyway.
-James
James Husted, Designer, Synthwerks LLC • www.synthwerks.com • james@synthwerks.com • info@synthwerks.com
     .

Re: [Doepfer_a100] Mixer: A-138a or A-138b ?

2017-02-27 by Diego Ragnini

Yeah Christian, thanks, by the way we did realize that James inadvertently inverted the polarity… :-)

Il giorno 27/feb/2017, alle ore 18:33, "christian ienni ienni23@yahoo.com [Doepfer_a100]" <Doepfer_a100@yahoogroups.com> ha scritto:

"A"s are linear, "B"s are exponential ;-)

Show quoted textHide quoted text

From: "james.husted@mac.com [Doepfer_a100]" <Doepfer_a100@yahoogroups.com>
To: Doepfer_a100@yahoogroups.com
Sent: Sunday, February 26, 2017 11:34 AM
Subject: Re: [Doepfer_a100] Mixer: A-138a or A-138b ?

Both the A and B versions will work for both audio and control voltage uses, the only difference will be in how the knobs “feel” when you turn them. The A has Audio Taper pots which make audio sound louder in a more familiar way as you turn the pots, the Linear Taper pots in the B versions will not get louder in the same way, with the same turning distances for instance, but will still mix audio signals. If you mix by ear and not knob positions, there won’t be any difference between them. The A version is not Audio Coupled (having caps in the audio line to stop DC), at least mine don’t and I don’t even know which ones I’m using when I use them.

Oh, and they both have the normalized DC voltage on input #1, allowing a DC offset voltage to be added to the mix if #1 does not have a cable plugged into it. At least the ones made after 2004 anyway.
-James
James Husted, Designer, Synthwerks LLC • www.synthwerks.com • james@synthwerks.com • info@synthwerks.com

.

Re: [Doepfer_a100] Mixer: A-138a or A-138b ?

2017-02-27 by james.husted@mac.com

That is Really funny. “A” is almost universally used on pots to denote Audio Taper (exponential as in 100kA) and “B” is almost universal on pots for Linear response curves (as in 100kB). I wonder why Doepfer went with the opposite for the module names? 

Just goes to show they are exchangeable to me, I have both kinds and use them in both ways.
-James

Show quoted textHide quoted text

> On Feb 27, 2017, at 10:13 AM, Diego Ragnini diegora@free.fr [Doepfer_a100] <Doepfer_a100@yahoogroups.com> wrote:
> 
> 
> 
> Yeah Christian, thanks, by the way we did realize that James inadvertently inverted the polarity… :-) 
> 
> 
> Il giorno 27/feb/2017, alle ore 18:33, "christian ienni ienni23@yahoo.com <mailto:ienni23@yahoo.com> [Doepfer_a100]" <Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com>> ha scritto:
> 
>> 
>> 
>> "A"s are linear, "B"s are exponential  ;-)
>> 
>> From: "james.husted@mac.com <mailto:james.husted@mac.com> [Doepfer_a100]" <Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com>>
>> To: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> 
>> Sent: Sunday, February 26, 2017 11:34 AM
>> Subject: Re: [Doepfer_a100] Mixer: A-138a or A-138b ?
>> 
>>  
>> Both the A and B versions will work for both audio and control voltage uses, the only difference will be in how the knobs “feel” when you turn them. The A has Audio Taper pots which make audio sound louder in a more familiar way as you turn the pots, the Linear Taper pots in the B versions will not get louder in the same way, with the same turning distances for instance, but will still mix audio signals. If you mix by ear and not knob positions, there won’t be any difference between them. The A version is not Audio Coupled (having caps in the audio line to stop DC), at least mine don’t and I don’t even know which ones I’m using when I use them. 
>> 
>> Oh, and they both have the normalized DC voltage on input #1, allowing a DC offset voltage to be added to the mix if #1 does not have a cable plugged into it. At least the ones made after 2004 anyway.
>> -James
>> James Husted, Designer, Synthwerks LLC • www.synthwerks.com <http://www.synthwerks.com/> • james@synthwerks.com <mailto:james@synthwerks.com> • info@synthwerks.com <mailto:info@synthwerks.com>
>> .
>>  
>> 
>> 
>> 
>> 
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