As wrote before, I recaptured the NTSC DTS laserdisc, because its DTS soundtrack was faulty; this time, even if I used the same laserdisc player with the same connection, all is OK, and the DTS soundtrack ready for the BD version is perfect!
Don't know why, but the previous captures had some duplicate/missing frames, but virtualdub didn't recognize them as dropped frames... maybe was because one of my cats jumped onto the laserdisc player (more than once) during the capture... _,,,^..^,,,_
Well, right now the AC3 and DTS english, and PCM italian and french soundtracks are ready; I think I'll capture the PCM english soundtrack from the AC3 laserdisc, but don't know if it's worth the time to capture the mono soundtrack from the same disc, and/or the analog stereo soundtrack from the DTS laserdisc...
as suggested by Papai, I've redone the clip #2 using the DTS NTSC video, captured at 720x480; this time the result is really better, take a look at the clip - SENDSPACE (40MB)
A picture is worth a thousand words, so...
original unprocessed captures, top NTSC, bottom PAL:
...restoration rule #37: "PAL is NOT always better than NTSC"...
Papai2013, you are now the official [ruLes] video quality tester!
Waiting for a confirmation that this time video is good enough, so I could start the (long) conversion.