Focus coil does not have sufficient range

[LukeSimon]

Originally Posted by Yamamaya42

No idea why they do what they did, that's most likely lost in the RCA engineering archives someplace, but they must have had some reason for it, but I've had very good results replacing those 2 resistors mentioned, especially the 66m one, I have seen it drift as high as 74-75m, yes I DO have one multimeter that can measure up to 100 meg ohms, I got it just to test these resistors. :O

Thanks. I will see if I can source resistors rated for 6kv. On a related topic, my T933 also has limited contrast range and limited sharpness range. The contrast gets bright enough, but there is very little difference between min and max contrast. Sharpness is similar. There is some difference in sharpness between min and max, but not nearly as much as my T931 where the highest sharpness setting makes the video very sharp to the point where pressing a button on a wired game controller causes enough electromagnetic noise to show up in the video. Were you able to fix the limited contrast range on your T933? Have you seen limited sharpness range?

I am hoping it doesn’t need an RF alignment, though I do own an oscope and a B&K 415 Mark & Sweep Generator. I know how to use my oscope, but haven’t spent the time to read the 100 page manual for the B&K 415.