Just got a 1984 RCA VJM2023S (CTC-121) chassis

[Blast]

Originally Posted by radiotvnut

Is that hissing noise actually a high pitched squeal (somewhere in the neighborhood of 15,750 Hz)? If it is, it's probably coming from the flyback or some other coil in the horizontal circuit.---snip---

Now, MINE does THIS (but I couldn't tell you at what intervals)! I would have never confused it with a hiss so I didn't bring it up.

If you were to have HV arcing I would think you'd see a real screwing up of the picture.
Brian