hello martin,

the ssm2164 is a high-quality ic with very low distortion,
so probably the "amusement" is caused by the valves.

best wishes

ingo



--- In Doepfer_a100@yahoogroups.com , "Martin Rudling"
<martinrudling@...> wrote:

>
>
> Hi!
>
> 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...
>
>
> >
>