1970s Zenith Console - Troubleshooting

[BeamT]

While the label says Motorola, the EIA Code 312 is made by Sylvania. Do you see a date code anywhere?

The yoke bracket is secured with double-sided foam tape, probably no longer pliable. I use a plastic spackling knife to gently separate the bracket from the CRT envelope. You will need some double-sided foam tape to resecure. The plastic yoke cases are also no doubt brittle, baking in place for over 40 years, remove gently.

It would be very interesting to know from the engineers who designed these sets, how long they thought they would last???

Your exisiting Tripler looks original to me. If its producing 25KV and its not arcing, its doing what it needs to and could outlast everything else. You could pull the screws, look for signs of arcing, and clean underneath. Your replacement divider looks good.

While you have the chassis out, consider replacing:

The boost filter, if you are using SAMS its C270 10uf 300v, this capacitor takes a beating, and can impact the picture quality.

4.7Meg 2w resister from the focus control to ground. I often find these drift, so will the focus, the original is a carbon comp resister.

Happy New Year!