Quote:
Originally Posted by Kevin Kuehn
This was about 12 years ago so I may be mistaken about the DVD, but that was my recollection. Is it possible the Agile modulator was reestablishing the sync to the AC line? I don't exactly understand the mechanism that allows this sync swim to happen, is it strictly related to the vertical sync beating against any AC ripple riding on the set's B+? When it affects the vertical lines I'd have to assume it's also messing with the horizontal lock? What we need is a good book that focuses on this issue.  |
I believe the problem is mostly effecting the horizontal sweep, probably at the horizontal oscillator. The hum effects the exact time that the oscillator output changes direction. The hum voltage effects when the horizontal osc. triggers in other words. The change in timing produces a kink in the sides of the picture. It appears to be a vertical problem because the location of the peak of the hum relative to the vertical waveform slowly changes (unless the vertical is synced to the hum), the kink moves.
There may be a similar problem in the vertical circuits but I think that the problem is less severe.