Thanks for your tips, bb.
I did it this way:
VirtualDub Sync
Capture MJPEG @20
384x57
4
Vertical reduction 2:1 cubic
Noise Reduction 3 ticks
After the capture:
Divx 2pass
pre processing source strong, gmc...quantizer 8 / 3 etc.
temporal smoother 3 ticks
2nd cleaner optimized with y cropping of 5
What I got was very good quality, for me it was a better view on the TV as the Tape was