RCA TV with a Problem

[Console User]

Originally Posted by zeno

Assuming its fine tuning there is no fine tuning on the set.
Try changing the CATV-NORM switch on the rear top or
antenna board usually.
Next would be resoldering the tuner & MTT conectors.
If they havnt been done they need it anyways.
Then it could be either the 4.5 trap or AFT tank coil
needs tweaking. If you havent done that before come back for advice !!!

73 Zeno

I had some soldering done on this set about a year ago. I assume that yes the problem is in the tuner. When the set warms up I get vertical lines in the background when I use a certain make of converter box. It doesn't do this with all converter boxes, rather just one brand in particular. I tried using RF#4 and the vertical line interference is way worse. I have also noticed a little hiss noise in my picture. I guess I can't expect miracles as this set is 28 years old. These vertical lines with the use of the converter box can give you a grayish or grainy looking picture.