I have been puttering along with this set in recent months. After recoating two mirrors and spending more time with the electronics, it makes a better semblance of a picture:
As you probably noticed by Sam's stretched head in that pic, the horizontal linearity is pretty awful. This test pattern shows that the vertical linearity is also poor:
I have gone back through the sweep circuits, replacing a handful of components, without finding an obvious cause for bad linearity in
both directions.
If you go back to page 1 of this thread, you'll see that I removed a one-capacitor modification made by a previous owner: that cap paralleled the width coil and the idea seems to have been to affect the width.
Now I'm tempted to reinstall a cap in that position and see what happens . . . .
If I can't solve the linearity problem with the electronics, I'm back to fiddling with the optics, which I honestly don't understand very well. One idea that occurred to me is that maybe I reinstalled the recoated spherical mirror off-kilter. Testing that theory would be difficult, since that mirror's mounting screws are not intended as adjusters. There's a lot of elbow room for the screws in those holes and absolutely no guide as to what is the correct position. In the factory, I supose they set this mirror using a jig.
I've been updating my restoration article as I go along. You can read more details and see more pics at:
https://antiqueradio.org/Emerson609P...Television.htm .
Regards,
Phil Nelson
Phil's Old Radios
https://antiqueradio.org/index.html