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Originally Posted by Richard D
The focus is not perfect nor can I find any focus adjustment, be it a moveable wire or a pot.
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The GE porta-color was my first NTSC set, an early one dated April, 1967. It has no focus swich, but in my schematics (model 213cwd) the focus can be soldered at different currents: 270 volts d.c., 670 booster voltage or to the ground. Comment: "connect focus lead, R116, to terminal which provides best focus."
The set has an inconsistent black level which vary with the programme. In the first time I adjust brightness every time when the camera changes the scene until I found that there is no black level automatic in this set.