hello bakis,

really strange. anyway, my newer a131's are not crystal clear,
but they definitely do not sound like zoran's. maybe doepfer
changed some more parts on the circuit, or those parts have
bigger tolerances than expected.
you should also try your polarizer for audio, my a133
produces lots of hum, more than my newer a131
at full amplification. thats why i only use it for
control voltages or to amplify my a118 noise generator ;-)

btw do you have a vca from analogue systems
i'm curious how they sound in comparison, because
they have both a linear and an exponential cv input.
unfortunately i don't own one.

best wishes

ingo


--- In Doepfer_a100@yahoogroups.com , Bakis Sirros
<synth_freak_2000@y...> wrote:

> hello ingo,
> first of all,dieter is away from the office for the
> next four days.
> regarding the new version a131's:that's really
> wierd,as my four new version a131's all have the same
> harsh sound and noise that i really don't like!of
> course, they amplify the signal much more than the old
> version a131's,but their noise is very annoying for my
> taste.whenever i use my new vesion a131's for smooth
> sounds(like bass)i never turn their input knobs(even
> the input1)to more than 3-4,because of their annoying
> harsh sound.as for the a133, i haven't ,still, used it
> for audio,only for cv processing.
> bakis.
>
>
>
>
>
> --- selfoscillate <synaptic_music@y...> wrote:
> >
> > hello zoran,
> >
> > yesterday i had just little time in the studio,
> > i haven't recorded anything, so please trust me :-)
> > anyway, i managed to compare an old and a new a131.
> > i tried sawtooth, triangle and sine after another,
> > coming from an a111. the a111 output was patched
> > directly into the vca in question. first i used
> > a constant +5v signal to keep the vca's open all
> > time.
> > after trying this, i used an a140 envelope instead.
> >
> > the newer a131 inputs are more sensitive, setting
> > the
> > input attenuator to approximately 6.5 resulted in
> > the
> > same loudness as with an old a131 set to 10.
> > i used this setting to check the hum of the vca's.
> >
> > i found that the newer a131 (or at least mine)
> > doesn't
> > produce more hum than the old one. maybe only a
> > slight
> > nuance, barely noticeable, and not as horrible as in
> > your wav-files. you really need good ears to find
> > something like hum on my a131's and you have to
> > search
> > for it until you hear it. that's why i couldn't
> > really
> > understand your problem, until i heard your posted
> > files.
> > your a131 doesn't sound like mine, absolutely not.
> > i don't have this issue on my a131's, no matter
> > if old or new. ok, the new a131 is louder when
> > it is unattenuated, sounding somewhat harsher then,
> > but still there is not that much hum.
> >
> > i tried an a132 also and it sounded a bit smoother
> > than
> > the a131, because it is linear. i'd say that our
> > a132's
> > sound the same.
> >
> > another funny thing is that my a133 polarizer
> > produces
> > much more hum than any other vca in my system, even
> > when it isn't actually amplifying a signal and this
> > also makes me wonder. it kept me from buying another
> > polarizer yet, but maybe my a133 and your a131 have
> > the same problem
> >
> > could it be that also other parts have been replaced
> > during the last few months maybe we can have some
> > information on this from dieter doepfer himself.
> > i hope that he is reading this.
> >
> > best wishes
> >
> > ingo
> >
> >
> >
> >
>
>
> =====
> Bakis Siros
> Parallel Worlds / Polariton
> Athens-Greece
> 1 group owner
> http://www.rubber.gr
> http://www.shimarecords.co.uk
> http://www.ward12.com
>
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