|
I'm also very interested in understanding this phenomenon. I have seen this on multiple different sets, both electrostatic 7JP4 sets and on some 10" and 12" sets. The observed phenomenon is that the vertical sweep gets compressed on lines with very bright features. I have never been able to trace down what causes it. Looking forward to seeing what gets figured out here.
On 7JP4 sets, I've tried adding multiple extra capacitors to help stabilize the HV, but it has no benefit.
The most recent set I saw this on was a metal CRT Zenith, so aquadag is not the issue for either of these two examples.
|