Doepfer

Folks,

I'm thinking about adding a filter to my A-100.  I have an A-122, and A-
121 and A-123 all of which I like, but I find myself looking for a 
filter with a more Moog-like sound.  I like the flexibility of the A-
108.  Any opinions about it's sound and how it compares to the A-120?

Thanks

agreed with others regarding the a108.  interestingly, my music is 
primarily "out" or experimental, yet the "noisy" or "wierd" filters 
such as 106 and wasp do not get plugged in as much as the more 
straightforward 108.

honestly, i can hardly imagine a more beautiful sounding filter.  
it's flexible, huge sounding, and it can get totally wacked out and 
crazy if you patch inthe feedback loop.

-t


--- In Doepfer_a100@yahoogroups.com, "pmclean_80207" 
<pmclean_80207@...> wrote:
>
> Folks,
> 
> I'm thinking about adding a filter to my A-100.  I have an A-122, 
and A-
> 121 and A-123 all of which I like, but I find myself looking for a 
> filter with a more Moog-like sound.  I like the flexibility of the 
A-
> 108.  Any opinions about it's sound and how it compares to the A-
120?

> 
> Thanks
>

i think the A108 is a great and warm filter that is closer to moog sound than the other doepfer filters. its one of my favourite A100 filters.


Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist
[Doepfer_a100] group owner
www. parallel - worlds - music. com
www. myspace. com/ parallelworldsmusic
www. myspace. com/ interconnectedmusic
www. myspace. com/ memorygeist
www. DiN. org. uk
www. musicamaximamagnetica. com
www. shimarecords. co. uk
www. rubberrecords. gr
Athens - Greece

--- On Mon, 9/22/08, pmclean_80207 <pmclean_80207@yahoo.com> wrote:

From: pmclean_80207 <pmclean_80207@yahoo.com>
Subject: [Doepfer_a100] A-108 opinions?
To: Doepfer_a100@yahoogroups.com
Date: Monday, September 22, 2008, 6:13 PM






Folks,

I'm thinking about adding a filter to my A-100. I have an A-122, and A-
121 and A-123 all of which I like, but I find myself looking for a 
filter with a more Moog-like sound. I like the flexibility of the A-
108. Any opinions about it's sound and how it compares to the A-120?

Thanks

 














      

[Non-text portions of this message have been removed]

The A108 is really good!It's my favourite next to the A102 and the Wasp
filter.
I also own the A123 and the A121 and A122. And some more :-)

I just sold my A120 which was okay.. but I definately prefer the A108
because it is more versatile.
It can sound like the A120 if you take the controls down a bit. The beauty
is that it can also go a bit more dirty.
I tried the A120 next to the A108 and it is definatly possible to make them
sound the same.
The beauty is I think in the 6db/oct output and the 48db/oct output.
Nice bonus is the bandpass.

I can't recommend the a108 more..

Greetings.

ernst









On Mon, Sep 22, 2008 at 6:10 PM, Bakis Sirros <synth_freak_2000@yahoo.com>wrote:

>   i think the A108 is a great and warm filter that is closer to moog sound
> than the other doepfer filters. its one of my favourite A100 filters.
>
> Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist
> [Doepfer_a100] group owner
> www. parallel - worlds - music. com
> www. myspace. com/ parallelworldsmusic
> www. myspace. com/ interconnectedmusic
> www. myspace. com/ memorygeist
> www. DiN. org. uk
> www. musicamaximamagnetica. com
> www. shimarecords. co. uk
> www. rubberrecords. gr
> Athens - Greece
>
> --- On Mon, 9/22/08, pmclean_80207 <pmclean_80207@yahoo.com<pmclean_80207%40yahoo.com>>
> wrote:
>
> From: pmclean_80207 <pmclean_80207@yahoo.com <pmclean_80207%40yahoo.com>>
> Subject: [Doepfer_a100] A-108 opinions?
> To: Doepfer_a100@yahoogroups.com <Doepfer_a100%40yahoogroups.com>
> Date: Monday, September 22, 2008, 6:13 PM
>
>
> Folks,
>
> I'm thinking about adding a filter to my A-100. I have an A-122, and A-
> 121 and A-123 all of which I like, but I find myself looking for a
> filter with a more Moog-like sound. I like the flexibility of the A-
> 108. Any opinions about it's sound and how it compares to the A-120?
>
> Thanks
>
> [Non-text portions of this message have been removed]
>
>  
>


[Non-text portions of this message have been removed]

Totally agree with that.My music is very 'out there' and the A106 has never
featured much in my tracks.
It's mainly the a108 and the a102. Okay okay and the Wasp ;-)

Ernst

On Mon, Sep 22, 2008 at 7:30 PM, thomasborax <thomasborax@yahoo.com> wrote:

>   agreed with others regarding the a108. interestingly, my music is
> primarily "out" or experimental, yet the "noisy" or "wierd" filters
> such as 106 and wasp do not get plugged in as much as the more
> straightforward 108.
>
> honestly, i can hardly imagine a more beautiful sounding filter.
> it's flexible, huge sounding, and it can get totally wacked out and
> crazy if you patch inthe feedback loop.
>
> -t
>
> --- In Doepfer_a100@yahoogroups.com <Doepfer_a100%40yahoogroups.com>,
> "pmclean_80207"
> <pmclean_80207@...> wrote:
> >
> > Folks,
> >
> > I'm thinking about adding a filter to my A-100. I have an A-122,
> and A-
> > 121 and A-123 all of which I like, but I find myself looking for a
> > filter with a more Moog-like sound. I like the flexibility of the
> A-
> > 108. Any opinions about it's sound and how it compares to the A-
> 120?
> >
> > Thanks
> >
>
>  
>


[Non-text portions of this message have been removed]

I have a question regarding A-108 pots.

My A-108 audio input is very sensitive to distortion. Often I set the Audio Level knob below 9 o'clock and then dialing the "right" sound is difficult. The pot is A50K, which I assume means the attenuation is already non-linear. Is there a way to improve "resolution" at the low end without sacrificing range? In other words, I would like less sensitivity at near counter clockwise position.

The other pots are B50K (linear?). If I swap all except Frequency pot to A50K, do I get less sensitivity at near counter clockwise position wihtout loss of range here too? Attenuating would then work like with Cwejman modules, which I prefer?

Hi Jari

replacing the potentiometer doesn't change anything. I don't have the 
schematics of the A108 here, but there is usually an input opamp, which 
has assumingly a too high amplification due to a defective or wrong 
feedback resistor. For dedicated error tracing some measuring equipment 
(oscilloscope, ohmmeter) and mesauring know how is needed.

I am sure Dieter will jump in soon.

Florian

jalmari3 schrieb:
> The other pots are B50K (linear?). If I swap all except Frequency pot to A50K, do I get less sensitivity at near counter clockwise position wihtout loss of range here too? Attenuating would then work like with Cwejman modules, which I prefer?

i also put my A108 audio input (of all 3 A108's of mine) to around 9 o'clock for non-distorted input.
so, i think this behavior of the A108 is normal and not defective.


Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist

[Doepfer_a100] group owner

www. parallel - worlds - music. com

www. myspace. com/ parallelworldsmusic

www. myspace. com/ interconnectedmusic

www. myspace. com/ memorygeist

www. DiN. org. uk

www. musicamaximamagnetica. com

www. vu-us. com

--- On Fri, 3/26/10, Florian Anwander <fanwander@mnet-online.de> wrote:

From: Florian Anwander <fanwander@mnet-online.de>
Subject: Re: [Doepfer_a100] Re: A-108 opinions?
To: Doepfer_a100@yahoogroups.com
Date: Friday, March 26, 2010, 10:48 AM







 



  


    
      
      
      Hi Jari



replacing the potentiometer doesn't change anything. I don't have the 

schematics of the A108 here, but there is usually an input opamp, which 

has assumingly a too high amplification due to a defective or wrong 

feedback resistor. For dedicated error tracing some measuring equipment 

(oscilloscope, ohmmeter) and mesauring know how is needed.



I am sure Dieter will jump in soon.



Florian



jalmari3 schrieb:

> The other pots are B50K (linear?). If I swap all except Frequency pot to A50K, do I get less sensitivity at near counter clockwise position wihtout loss of range here too? Attenuating would then work like with Cwejman modules, which I prefer?    





    
     

    
    


 



  






      

[Non-text portions of this message have been removed]

Same here..

On Fri, Mar 26, 2010 at 11:53 AM, Bakis Sirros
<synth_freak_2000@yahoo.com>wrote:

>
>
> i also put my A108 audio input (of all 3 A108's of mine) to around 9
> o'clock for non-distorted input.
> so, i think this behavior of the A108 is normal and not defective.
>
>
> Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist
>
> [Doepfer_a100] group owner
>
> www. parallel - worlds - music. com
>
> www. myspace. com/ parallelworldsmusic
>
> www. myspace. com/ interconnectedmusic
>
> www. myspace. com/ memorygeist
>
> www. DiN. org. uk
>
> www. musicamaximamagnetica. com
>
> www. vu-us. com
>
> --- On Fri, 3/26/10, Florian Anwander <fanwander@mnet-online.de<fanwander%40mnet-online.de>>
> wrote:
>
> From: Florian Anwander <fanwander@mnet-online.de<fanwander%40mnet-online.de>
> >
> Subject: Re: [Doepfer_a100] Re: A-108 opinions?
>
> To: Doepfer_a100@yahoogroups.com <Doepfer_a100%40yahoogroups.com>
> Date: Friday, March 26, 2010, 10:48 AM
>
>
>
>
> Hi Jari
>
> replacing the potentiometer doesn't change anything. I don't have the
>
> schematics of the A108 here, but there is usually an input opamp, which
>
> has assumingly a too high amplification due to a defective or wrong
>
> feedback resistor. For dedicated error tracing some measuring equipment
>
> (oscilloscope, ohmmeter) and mesauring know how is needed.
>
> I am sure Dieter will jump in soon.
>
> Florian
>
> jalmari3 schrieb:
>
> > The other pots are B50K (linear?). If I swap all except Frequency pot to
> A50K, do I get less sensitivity at near counter clockwise position wihtout
> loss of range here too? Attenuating would then work like with Cwejman
> modules, which I prefer?
>
> [Non-text portions of this message have been removed]
>
>  
>


[Non-text portions of this message have been removed]

Hi

> Same here..
>> i also put my A108 audio input (of all 3 A108's of mine) to around 9
>> o'clock for non-distorted input.
>> so, i think this behavior of the A108 is normal and not defective.
If Dieter won't have the time to answer today, I'll have a look at the 
schematics at home.

Basically I think it should be not normal that the signal already 
distorts over 9 o'clock position. At the most gear I own the 3 o'clock 
position is where an input level is set to 100%. I'd also understand 
below 12 o'clock damping, above amplification, but 9 o'clock position is 
too low.

Maybe it is a designflaw which has never been detected, because they 
test only with monophonic saw or - even more undetectable - with rectangle.

Florian

i do not think its a design flow...(Dieter?)

after 9 o'clock (and in combi with the resonance knob) is where all the fun starts....     :-)


Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist
[Doepfer_a100] group owner
www. parallel - worlds - music. com
www. myspace. com/ parallelworldsmusic
www. myspace. com/ interconnectedmusic
www. myspace. com/ memorygeist
www. DiN. org. uk
www. musicamaximamagnetica. com
www. vu-us. com


--- On Fri, 3/26/10, Florian Anwander <fanwander@mnet-online.de> wrote:

> From: Florian Anwander <fanwander@mnet-online.de>
> Subject: Re: [Doepfer_a100] Re: A-108 opinions?
> To: Doepfer_a100@yahoogroups.com
> Date: Friday, March 26, 2010, 1:42 PM
> Hi
> 
> > Same here..
> >> i also put my A108 audio input (of all 3 A108's of
> mine) to around 9
> >> o'clock for non-distorted input.
> >> so, i think this behavior of the A108 is normal
> and not defective.
> If Dieter won't have the time to answer today, I'll have a
> look at the 
> schematics at home.
> 
> Basically I think it should be not normal that the signal
> already 
> distorts over 9 o'clock position. At the most gear I own
> the 3 o'clock 
> position is where an input level is set to 100%. I'd also
> understand 
> below 12 o'clock damping, above amplification, but 9
> o'clock position is 
> too low.
> 
> Maybe it is a designflaw which has never been detected,
> because they 
> test only with monophonic saw or - even more undetectable -
> with rectangle.
> 
> Florian
> 
> 
> ------------------------------------
> 
> Yahoo! Groups Links
> 
> 
>     Doepfer_a100-fullfeatured@yahoogroups.com
> 
> 
>

> i also put my A108 audio input (of all 3 A108's of mine) to 
> around 9 o'clock for non-distorted input.
> so, i think this behavior of the A108 is normal and not defective.

I was not in the company yesterday as I had to attend a boring "safety at work" seminar because of the German law (unfortunately only ~5% of my time I'm able to do what I like most: design of new modules/units or playing with them).

The audio input of the A-108 is very sensitive (much more than e.g. the A-120). Many users recommended to have more sensitive inputs for clipping/distortion available. If the audio input resistor R1 (standard value 10k) is replaced e.g. by 47k or 100k the input becomes 5/10 times less sensitive.

Best wishes
Dieter Doepfer

P.S.
These are the law codes for the potentiometers used in the A-100: 

A = log
B = linear
C = inverse log.