Doepfer

>
> > I did a search of the database and didn't see anything describing this.
> >
> > I just got a used a-132 dual voltage controlled amplifier.  The
> > upper VCA is functioning properly.  The lower VCA is not working
> > properly.  It has a very low output and "thumps" or "pops" when
> > it opens/closes no matter what signal I use to open it.  There's
> > a very large difference in the upper and lower channels.
> >
> > I was passing audio through it and opening it with an LFO.  The
> > upper channel behaves as expected but the lower does not with the
> > same signals.
> >
> > I also have another A-132 and both channels function very similar
> > and are similar to the upper channel on the problematic module.
> >
> > Anyone have any ideas where to look for the problem?
> 
> From the distance it's difficult to find out what's wrong. If you are
> experienced with electronics you could swap the integrated circuits of the
> upper and lower section to find out if one of the integrated circuits is
> defective. Maybe the module has to be readjusted (nothing but minimizing the
> "plop" input connected to GND and e.g. an ADSR as CV).
> 
> Best wishes
> Dieter Doepfer
>

On Thu, Mar 26, 2009 at 11:42 AM, madapples1 <rusty0306@msn.com> wrote:
> yes, I understand it can be difficult to trouble shoot like this. Thanks for
> the reply.
>
> I thought about swapping the ICs to see if it follows one but wanted to ask
> first. I will try that.
>
> Thanks again.
>
> --- In Doepfer_a100@yahoogroups.com, <yahoo@...> wrote:
>>
>> > I did a search of the database and didn't see anything describing this.
>> >
>> > I just got a used a-132 dual voltage controlled amplifier. The
>> > upper VCA is functioning properly. The lower VCA is not working
>> > properly. It has a very low output and "thumps" or "pops" when
>> > it opens/closes no matter what signal I use to open it. There's
>> > a very large difference in the upper and lower channels.
>> >
>> > I was passing audio through it and opening it with an LFO. The
>> > upper channel behaves as expected but the lower does not with the
>> > same signals.
>> >
>> > I also have another A-132 and both channels function very similar
>> > and are similar to the upper channel on the problematic module.
>> >
>> > Anyone have any ideas where to look for the problem?
>>
>> From the distance it's difficult to find out what's wrong. If you are
>> experienced with electronics you could swap the integrated circuits of the
>> upper and lower section to find out if one of the integrated circuits is
>> defective. Maybe the module has to be readjusted (nothing but minimizing
>> the
>> "plop" input connected to GND and e.g. an ADSR as CV).
>>
>> Best wishes
>> Dieter Doepfer
>>
>
>

>
> I had the same problem recently when I ordered one from Thomann.
> I send it back and they send me a new one having the same problem.
> I ended up buying some new ICs myself and solved the problem that way.
> 
> I'm curious if you ordered it a thomann as well..
> 
> greetings,
> 
> Ernst
> 
> 
> On Thu, Mar 26, 2009 at 11:42 AM, madapples1 <rusty0306@...> wrote:
> > yes, I understand it can be difficult to trouble shoot like this. Thanks for
> > the reply.
> >
> > I thought about swapping the ICs to see if it follows one but wanted to ask
> > first. I will try that.
> >
> > Thanks again.
> >
> > --- In Doepfer_a100@yahoogroups.com, <yahoo@> wrote:
> >>
> >> > I did a search of the database and didn't see anything describing this.
> >> >
> >> > I just got a used a-132 dual voltage controlled amplifier. The
> >> > upper VCA is functioning properly. The lower VCA is not working
> >> > properly. It has a very low output and "thumps" or "pops" when
> >> > it opens/closes no matter what signal I use to open it. There's
> >> > a very large difference in the upper and lower channels.
> >> >
> >> > I was passing audio through it and opening it with an LFO. The
> >> > upper channel behaves as expected but the lower does not with the
> >> > same signals.
> >> >
> >> > I also have another A-132 and both channels function very similar
> >> > and are similar to the upper channel on the problematic module.
> >> >
> >> > Anyone have any ideas where to look for the problem?
> >>
> >> From the distance it's difficult to find out what's wrong. If you are
> >> experienced with electronics you could swap the integrated circuits of the
> >> upper and lower section to find out if one of the integrated circuits is
> >> defective. Maybe the module has to be readjusted (nothing but minimizing
> >> the
> >> "plop" input connected to GND and e.g. an ADSR as CV).
> >>
> >> Best wishes
> >> Dieter Doepfer
> >>
> >
> >
>