18-06-2021, 05:01 PM
(This post was last modified: 18-06-2021, 05:05 PM by Murphyv310.)
Hi.
The picture Freya is showing is Striations, it's a line timbase issue, often the linearity or width coils. Usually these have a resistor in parallel with them again to damp out the coil ringing. It also can be LOPT or scan coils. Adrian's issue is IF or Video related, I'd definitely plump for Alignment.
You'd see the issue extremely well on a Pulse and Bar test signal. (Vertical Interval Test Signal, VITS). With the scope on the video detector and then the CRT cathode which will tell you if it's IF or Video amp related.
The picture Freya is showing is Striations, it's a line timbase issue, often the linearity or width coils. Usually these have a resistor in parallel with them again to damp out the coil ringing. It also can be LOPT or scan coils. Adrian's issue is IF or Video related, I'd definitely plump for Alignment.
You'd see the issue extremely well on a Pulse and Bar test signal. (Vertical Interval Test Signal, VITS). With the scope on the video detector and then the CRT cathode which will tell you if it's IF or Video amp related.
