@ frank1981: Yes, that is all you really need. (For YC / S-Video)
If you have an "older" C64 modell, you might see some improvements, if you filter the AEC signal out. (on my "newer" C64 it hasn't made the picture any better)
Filtering out more signals, that could interfere with the image signal, was mostly experimental.
Be shure to use carbon resistors.
The metall precision resistors pick up / send out to much noise, if they are tightly packed to each other.