You cannot have one without the other in this effect or
Make your own sepia tint and search the internet for a movie file with scratches and an alpha channel.
Hello Udo V,
You can play with the Damage and Jitter settings of the Old Film effect by applying the effect onto the clip and then going to the Applied effects panel (which may be opened by going to Window->Applied Effects or can also be found on the right corner of the application).
Please tell us if that helped.
OP already knows how to use the film effect
But wants it without the flicker.
That is not possible as the scratches, the tint and the flicker are build in one slider...
If one turns down the slider (damage) the scratches are also gone which OP want to keep.