The change with warm up almost has to be the CRT.
The ghost also probably is. When CRT's start getting weak they
"shoot flames" to the right of high brightness & contrast
scenes. Sometimes they are white or the color of the weak gun (s).
Turning down the brite & contrast usually improves it.
Also if the adjustments were done by eye not "by the book"
that may be part of it. Other than that not much else
will do it. BTW whats the chassis number ??
As far as xmas lights go I dont know. As KV said you want to
avoid 300 ohm, it can pick up garbage. Most sets have a coax
input, use that & avoid any matching doo-dads.
73 Zeno
