Is this a bad CRT? 10BP4

[Kevin Kuehn]

Try turning your room lighting off. Next turn down the TV's brightness control, and see if the picture(contrast) control can give you a more defined with better contrast picture. With the brightness turned down you may get better focus control too. Keep in mind you can't increase screen blackness with the TV's controls unless the ambient room lighting is low. Think of it as a movie projected on a screen, and if you bring the room lights up too bright you loose picture contrast. These early CRT's were never intended to be viewed in a well lit room.

[Yamamaya42]

Originally Posted by Kevin Kuehn

Try turning your room lighting off. Next turn down the TV's brightness control, and see if the picture(contrast) control can give you a more defined with better contrast picture. With the brightness turned down you may get better focus control too. Keep in mind you can't increase screen blackness with the TV's controls unless the ambient room lighting is low. Think of it as a movie projected on a screen, and if you bring the room lights up too bright you loose picture contrast. These early CRT's were never intended to be viewed in a well lit room.

true, but the image should not be THAT dim, something is not right here.

example, my set.
http://suzaku.live-evil.org/0226241857b.jpg
Taken with VERY bright light on, but then again my 12LP4 is an exception, having spent more than half of it's life in a basement unused!

[old_coot88]

By golly there is a locked-in picture there. Couldn't see it at first. First thing I would look for is an open peaking coin the video chain, anywhere between the vid detector and CRT. Blooming is generally from HV being lugged down due to a weak HV rectifier.