Not Quite Sure What To Call This

[Phil Nelson]

I honestly don't recall if my 630TS showed those lines, although I know I have seen similar lines in some old TV or another during the last several years. Maybe tomorrow I can fire up the 630 and look at some images. It's in a location where it looks pretty but rarely gets played.

The content that we watch today has lots of lettering with extreme contrasts --static title screens, screens with text crawl at the top and bottom, etc. -- which brings out the worst in some old TVs.

Phil Nelson

[Phil Nelson]

I was too curious to wait, so I played my 630TS and it doesn't show those lines, even on static title screens with extreme contrast.

Turning the Picture control from one extreme to the other gives you no signal at the CCW end of the range, and then if you turn it up (CW) too far, the picture distorts and eventually loses sync.

The tuner has gotten a little flaky, no doubt from sitting around without being played. I really need to go around and exercise all of my restored sets more often.

Phil Nelson

[vts1134]

Thanks for looking Phil. I wouldn't describe this as full width ribbon lines in the picture. The trailing white only happens to the right if the brightness control is set to a normal level. It's like some one takes the right hand edge of a white object and pulls it out horizontally to the right.

[old_coot88]

Originally Posted by vts1134

...I wouldn't describe this as full width ribbon lines in the picture. The trailing white only happens to the right if the brightness control is set to a normal level. It's like some one takes the right hand edge of a white object and pulls it out horizontally to the right.

Oh, so the lines on the left appear only at max brightness but not at normal level. Right?

For the heck of it, double check the value of R138 (grid leak resistor of 1st video tube V115). The print is really smudged but it looks like 475K.

And double check R140 (plate load resistor, 3.3K)

Pin 2 (suppressor grid, G3) is grounded. Check to be sure the tube's pin actually makes contact thru the socket to ground.

Wiggle V115 and V116 in their sockets and see if there's any change in the wackadoodle lines.

Did you try subbing V115 and V116?