> hi dieter
>
> that's preciselly the point. what i've see in the majority of radios
> i've opened is that tune is controlled by a variable condenser.
>
> maybe do you know how to do a voltage controlled variable condenser
> if you had some small schematic or knew where to find it i would try
> by myself.
>
> thanks
> gaspar uleg

Sorry - I have no schematics for a voltage controlled capacitor and I think
it's not easy.
In older circuits indeed variable capacitors are used (open versions with
multiple discs that change the overlapping range while the tune knob is
operated). But in newer designs I have seen variable resistors as they can
be manufactured much cheaper (e.g. the TEMIC FM tuner 1890).

But please don't me ask details. That's not my field of knowledge.

Best wishes
Dieter Doepfer