some basic questions after recap Emerson 637A

[Phil Nelson]

Originally Posted by CJVx

I did adjust the ion trap magnet for the brightest picture. As found, It was preset as far back as it will go until stopped by the plug socket, and that seems to be the area where the picture is the brightest at the proper rotation. Not sure if i remember any other sets with it all the way back there.

Is it possible that someone reversed the ion trap magnet? Sounds silly, but odd things can happen if a teenager gets his hands on Grandpa's old TV and is inspired to "fix" things.

Some ion trap magnets are marked with a little arrow, which should point toward the front of the CRT. Other magnets don't have an arrow, so don't freak if yours lacks one.

You won't hurt anything if you flip the magnet back to front and try sliding it forward and back on the CRT neck, and rotating, in the usual manner for finding the "sweet spot" with maximum brightness. If no improvement, put it back the way you found it and look for other causes.

Just an idea . . .

Phil Nelson
Phil's Old Radios
https://antiqueradio.org/index.html

[CJVx]

Originally Posted by Phil Nelson

Is it possible that someone reversed the ion trap magnet? Sounds silly, but odd things can happen if a teenager gets his hands on Grandpa's old TV and is inspired to "fix" things.

Some ion trap magnets are marked with a little arrow, which should point toward the front of the CRT. Other magnets don't have an arrow, so don't freak if yours lacks one.

You won't hurt anything if you flip the magnet back to front and try sliding it forward and back on the CRT neck, and rotating, in the usual manner for finding the "sweet spot" with maximum brightness. If no improvement, put it back the way you found it and look for other causes.

Just an idea . . .

Phil Nelson
Phil's Old Radios
https://antiqueradio.org/index.html

Phil, you were onto something , I flipped it around and it’s in a position midway on the neck now, although I did not gain any brightness in the sweet spot of the new position.

Also I changed out all the mica caps in the horizontal circuit, still jitters.

The dag is actually in pretty good shape and the contacts by the yoke are making an electrical connection.

I am thinking maybe there is a bad connection at the yoke...for the reason that i *think* I am getting changes when I tap on the yoke and or pull on the wires. No changes when I poke and spray anything under the chassis. The only changes I might be perceiving are if I flex the chassis when it’s running.