Doepfer

Thanks!

It´s a bit funny, I think, that they (A&H) have chosen such an atypical chip 
for filtering. I have been reading the info at "analog devices" and this 
application is just mentioned very briefly. Anyhow, it sounds great as a 
filter, but provides no selfoscillation.  But I´m doing fine without.
   Maybe my selling of the Mutronics-LP-filter and Analogue Systems FB3, can 
say something about the quality. I´m actually gonna use the money to buy 
another VF-1, to get 24dB in stereo. But this choice is very much because 
I´m lazy, and I find the manner of speaking "less is more" to be very true 
regarding audio-machines, but that´s me...
  If the Mutator had been multimode I´d keep it, but LP only just makes me 
frustrated while tweaking. And of course the VF1 valves and the midi 
(without passing a MCV interface) is attractive to the restless personality. 
I´m sending the Kenton M-CV to a modularist in the south of Sweden today. 
The only thing I still have pure analogue is the AnaSys filterbank. I´ve 
changed my mind on that one to, I´m selling it. Same price: 2500 SEK, that 
should be 270 EUR. I have one adjustment to offer you, though..: I´ll pay 
the shipping for you! (Europe)

Best regards
/Martin





>From: "selfoscillate" <synaptic_music@yahoo.com>
>Reply-To: Doepfer_a100@yahoogroups.com
>To: Doepfer_a100@yahoogroups.com
>Subject: [Doepfer_a100] Re: technichals...
>Date: Mon, 03 Apr 2006 05:56:12 -0000
>
>
>hello martin,
>
>over the weekend i checked my technical
>documents about the ssm2164 again.
>this chip can be found in several modules.
>for example, blacet uses it a lot. usually
>the ic itself is not configured to work as
>a filter, but it can be found in vcf's
>as a support chip to make parameters
>voltage-controllable or for mixing of
>filter stages (like in the a107).
>
>as others pointed out, the ssm2164 can of
>course be used as a filter circuit, but
>that doesn't seem to be the typical purpose.
>the only module i found where the ssm2164
>is also configured as a filter is the blacet
>improbability drive, but this module cannot
>be used for filtering of a given signal,
>as there is no filter input jack available.
>so i cannot say anything about it's sound
>as a filter. all i can say is that the ssm2164
>is doing a great job as vca, but thats obvious.
>
>best wishes
>
>ingo
>
>
>
>--- In Doepfer_a100@yahoogroups.com, "Martin Rudling"
><martinrudling@...> wrote:
> >
> > Ooops sorry I hit the send button by mistake...
> >
> > Well I´ll use the opportunity to thank you all for your input!!
> >
> > Thanks!
> >
> > And also I would like to encourage those who are having thoughts of
>adding
> > some valves to your modular. It´s ssooo nice!! Fat, creamy,
>organic, hot and
> > you name it...
> >
> > It seems like the mutator is sold today, to a friend of mine. And I
>have
> > found a second FB3 for sale in England, so I think I´ll buy it, to
>go
> > stereo, which means that my unit is no longer for sale.
> >
> > m
> >
> >
> >
> >
> > >From: "Tim Stinchcombe" <timothy@...>
> > >Reply-To: Doepfer_a100@yahoogroups.com
> > >To: Doepfer_a100@yahoogroups.com
> > >Subject: [Doepfer_a100] Re: technichals...
> > >Date: Thu, 30 Mar 2006 20:44:52 -0000
> > >
> > >Hi Martin,
> > >
> > >The SSM2164 is made by Analogue Devices:
> > >
> > >http://www.analog.com/UploadedFiles/Data_Sheets/15183786ssm2164.pdf
> > >
> > >which with the right know-how can be turned into a 4-pole 24dB
> > >filter, or from what Allen Heath have at their website for thr VF-
>1,
> > >2 x 2-pole state-variable filters (so basically 12dB each), which
> > >thus give low-, high- and band-pass, and which if run one after the
> > >other gives 24dB (hence the 'mono' switch on the back).
> > >
> > >I suspect a lot of the quality of the sound comes from the
> > >overdrive/clipping introduced by the valve input section, but
>that's
> > >only a guess - the total sound will depend on both chip and valves,
> > >but how much it would change, say, if the valves were replaced by
> > >transistors would probably be difficult to guess without trying it!
> > >
> > >Tim
> > >
> > > > I´ve asked Allen & Heath tech support what chips they used for
>the
> > >VF-!
> > > > analogue valve stereo-filter. I didn´t get much wiser from the
> > >answer
> > > > though.
> > > > Maybe some one here knows about the chip SSM2164?
> > > >
> > > > (As you will see this is cuts from 2 different e-mails)
> > > >
> > > > >>>The active circuitry in the VF-1 is based on the SSM2163 Quad
> > >VCA IC in
> > > > an analogue filter configuration, supported by standard TL072
>op-
> > >amps
> > > > and of course a pair of ECC82 valves.
> > > > >Thanks for your reply. Please note the typo in my last reply
>and
> > >the fact
> > > > >that it is the SSM2164, not 2163 IC that is the active VCA.>>>
> > > >
> > > > I´m curious, cuz I really love the sound of this machine, and I
> > >wonder how
> > > > much of this amusement is due the valve/overdrive section...
> > > >
> > > >
> > > > >
> > > >
> > >
> > >
> > >
> > >
> > >
> >
>
>
>
>
>