Quote:
Originally Posted by old_tv_nut
Regarding poor DC coupling, I am torn between keeping it authentic or making it better than original. So far I have come down on the original side, a good part because I'm lazy.  |
I suppose you noticed it too? It is not too bad but is noticeable at the opening and closing credits of a program when high luminance change actors appear and the background it overlays dims. The original contrast control which was a degenerative DC bias control vs the modified variable AC cathode bypass I think provided better dc coupling. Its downside was the uncomfortable interaction between brightness and contrast. However the original circuit I believe also provided the proper dc reference to set best gun tracking. I do notice this set is difficult to get consistent tracking due to the way the luma feeding the matrix is derived. Could open another thread to discuss this. I feel I see the problem and haven't bothered to come up with a good solution