Quote:
Originally Posted by Phil Nelson
I have a working CTC-7 and CTC-11, but I'm not sure how to do what you're asking. With the vert hold control I can adjust to a slow roll, but it won't lock with that bar in the middle of the screen. It's pretty hard to judge average brightness, etc., with everything rolling.
Phil Nelson
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Yeah, I know it is tough. First adjust the brightness up slightly to make the sync bar grey. If you can hold the bar long enough in the middle of the screen, when the video goes from bright or a well lit scene to black, ideally the bar will remain the same shade of grey. The degree of the bar changing in brightness depend upon how good the set is maintining correct DC passage.
Expect a small change which is generally acceptable. If the diffence is very noticable, then the dc component has been lost. On most '50's Black and White TV's, the DC component is totally dispensed with and the difference will be quite noticable.
As I said earlier, your 1946 TS630 and my 1949 RCA will pass this test with flying colors....(err maybe "flying back and white" only).