More screen anomalies

[Username1]

This is some interference from a ringing of a sharp blanking diode, or transistor, or damper, etc. that is not decoupled properly. Take a scope and see if you can see it on the power supply near the video amp transistors.

Did you re-cap this set?

[TinCanAlley]

I don't think I'm the first to try and fix the jail bars. The more I check the horizontal, the more evidence I find of someone else going the same route. The first was the diode in the blanking circuit. It had already been cut and soldered back together. Now I see that someone cut and resoldered the leg of the boost rectifier (CR219). I'll have to get back under the chassis to see if they also did the same to the damper (CR218) on the horizontal output. I'll also look at the booster rectifier (CR221). They're all the same part number: 103-193. I haven't been able to find NOS, but NTE makes a replacement (NTE506).

[TinCanAlley]

Originally Posted by Username1

This is some interference from a ringing of a sharp blanking diode, or transistor, or damper, etc. that is not decoupled properly. Take a scope and see if you can see it on the power supply near the video amp transistors.

Did you re-cap this set?

I went through and replaced all transistors in blanking, video output, amps, etc. There was no change and I put all the originals back and kept the new for backups. I replaced the blanking diode and the resistors that work with it, but that didn't help. That leaves the three diodes around the horizontal output and I'll be ordering them tomorrow.