Sony SLC5 Video Unstable picture
 

I've just bought an ancient C5 from e-bay. Got it running by changing
all the belts and giving it a good clean but the picture is unstable
there is a slight flutter on the sound and the tracking control is
ineffective. I remember working on these machines years ago and
changing some caps in the servo cicuitry but cant for the life of me
remember which ones. Can anyone help please.