My First Predicta

[kvflyer]

Congratulations!!!! Excellent and I will NOT insert that obnoxious dancing banana!

[Chris K]

Then I will!

[Electronic M]

Good work finding the issue!

[Yamamaya42]

Now it's time to post some screenshots of video from the general year the set was made, like The Twilight Zone or Bonanza! :P
In the same way I picked Lost in Space for my 1966 CTC-16XL!

[Chris K]

Originally Posted by Yamamaya42

Now it's time to post some screenshots of video from the general year the set was made, like The Twilight Zone or Bonanza! :P
In the same way I picked Lost in Space for my 1966 CTC-16XL!

Honeymooners...probably too early...The Munsters...that's the ticket!

Need to get it on the pattern generator and dial it in first. Then I need to buff and polish this fish smelling plastic safety cover. I've had some luck so far using automotive buffing compound but I bought a car headlight restoration kit like Bob suggested in one of his thousand Predicta posts over the years. We'll see how that does.

[Yamamaya42]

Car 54, Where Are You?!

[Chris K]

Originally Posted by Electronic M

Good work finding the issue!

Thanks so much Tom! I know I take you guys down some dark alleys chasing red herrings. I appreciate the help so much.

[Chris K]

One of the reasons that was hard to run down is because the Sams shows it in the schematic but it’s not identified in the chassis photos and it does not have the alphabetical/numerical designation like R63 or R57. I don’t think it’s in the parts list either.

[bandersen]

Later revisions did not use that resistor. The original Philco service info does show it.

[Chris K]

OK power issues cleared up. I'm running a crosshatch pattern from the generator. Looks like the vertical is OK, I can get it to lock but I believe there are serious horizontal sync problems. I've got a NOS set of Holiday tubes on order in case this is a tube issue. Sound is good...tube is nice and bright, sharp and the contrast works great. The only problem is I have spaghetti for an image.

Couple of questions. How is this horizontal linearity magnet supposed to work? How do you do adjustments with it? It's basically a bar magnet on an L bracket that's wedged between a band around the yoke. It has the Philco hidden adjustment pots behind the brightness, vertical and horizontal controls. Should I wait until I have reliable tubes before I start playing around with these adjustment controls?

Thanks everyone

Chris

[bandersen]

You push the magnet forward or pull it back. It either gives that side of the screen a slight assist in deflecting electrons or holds it back. That has nothing to do with your issue though. I'm thinking it might be more of an issue in the video amp. Like you have ringing in the video signal or the if alignment is off. What effect does fine tuning have? How do other patterns or live video look?

[old_tv_nut]

What generator are you using?

[Electronic M]

I get the feeling the horizontal lock is off in that picture and 3 of the vertical bars are getting smeared across the screen during retrace. I forget if this model had the H AFC SS diodes, but those are often the problem when you have good vertical sync, but no horizontal sync.

[Chris K]

Originally Posted by bandersen

You push the magnet forward or pull it back. It either gives that side of the screen a slight assist in deflecting electrons or holds it back. That has nothing to do with your issue though. I'm thinking it might be more of an issue in the video amp. Like you have ringing in the video signal or the if alignment is off. What effect does fine tuning have? How do other patterns or live video look?

Fine tuning doesnt make it any better or worse...It doesn't help with clearing it up if that's what you mean. I haven't tried live video yet. The single cross pattern has a horizontal line across the middle of the screen and 3, equally spaced vertical lines. Single dot has 3 dots across the center of the screen left to right. Generator is a Sencore VG48. I'll try some live video in a bit.

[Chris K]

This is a generated single cross that's supposed to be centered