I get a similar problem all the time!!!!

Happens on a very intermittant basis. While using an envelope as
clock source, I smack a key and can get that typical repeating and
pitch shifting "Daaaaaaaa-daaaaaaaa-daaaa-da-da-da-da da" noise, and
then when it feels like it, it stops responding.

Also, depending on how I have the delay clock knob position, I'll
get this extremely high resonant noise. Sometimes it's more subtle
like the frequency it's producing is so high that it's not in the
audible spectrum, but its enough to hurt my ears. I fear that I've
even damaged a bit of my high-end with this....

Is this a defect in the unit, or is that the clock noise that the
manual talks about generally requiring an LPF And if it is, where
exactly should the LPF be inserted

--- In Doepfer_a100@yahoogroups.com , <hardware@...> wrote:
>
> > Hi all,
> >
> > My tapped bbd module suddenly has a limited range, it can now
only
> > do short delaytimes, probably 25-40% of the range it should
have. In
> > other words: it can't produce the aliasing sound anymore. The
first
> > time I fired it up it was ok, second time it had this problem.
Any
> > ideas
> >
> > greetings, Anton
>
> Sounds like a fault. Probably the "heater" of the temperature
controlled
> logarithmic converter of the HSVCO is defective. If you are able
to replace
> an integrated circuit we can send you a new one. As all circuits
are
> equipped with sockets no soldering is required but only removing
the old
> circuit and inserting the new one.
>
> Please tell me your postal address (directly to me, not to the
Yahoo group)
> and we will send you the spare part if you agree. Otherwise please
send the
> module for repair.
>
> Best wishes
> Dieter Doepfer
> (hardware@...)
>