Much to report to all of you. First off I replaced my temporary modern Radio Shack resistors with some beautiful old carbon resistors. "Out With The New, In With The Old!" That's all kind of boring and just those things you do when you want an original look at the end of the restoration. On another note I have finally got off my
and got an oscilloscope for the bench. I put the scope into service right off the bat testing a theory. If you remember I had two problems, ghosting in the image and some horizontal tearing towards the top of the screen. I had previously noticed that the two were mutually exclusive as I adjusted the picture control. After thinking about it overnight I thought that maybe the ghosting problem was me over-driving of the signal (as old_coot88 explained before " The contrast ('Picture') control adjusts the gain of the 2nd IF tube"). I used the RF Attenuation control on my B&K to achieve the same results as adjusting the picture control on the set. What I got was horizontal tearing at the low end of the signal and as the gain was cranked up the tearing disappeared but the ghosting appeared. What I theorized was that the horizontal sync pulses were being attenuated at a normal signal level forcing me to overdrive the signal to bring it back thereby inducing ghosting.
How nice it is to have a scope to test this theory.
Here is the set with the signal cranked and without any horizontal tearing.
Here are the sync pulses.
Here is the set at what I think would be a normal signal level (half way up the dial on the B&K 1077, which looks to be about the same level coming off my rf modulator on my DVD player). This is the level at which I get horizontal tearing.
And here are the sync pulses.
It seems to me that I have a sync problem. Am I off base?
I haven't looked into possible causes of the problem, I'll leave that one for tomorrow.