CBS Columbia

[Yamamaya42]

Originally Posted by timmy

I already recapped this set works really nice but between like commercials you can see bearly see the line top to bottom. It has vertical and horizontal produces a nice pic I’m probably not going to worry about it but was wondering.

OH that.. is caused by a weak horizontal output tube, most of the time. my Stromberg Carlson BW set did that when cold until I replaced it.

[timmy]

Originally Posted by Yamamaya42

OH that.. is caused by a weak horizontal output tube, most of the time. my Stromberg Carlson BW set did that when cold until I replaced it.

A weak hot even though it’s got a bright picture and perfect hv.

[Yamamaya42]

Originally Posted by timmy

A weak hot even though it’s got a bright picture and perfect hv.

yes, a faint line in the center, a weak horizontal output tube is the first suspect.

[old_coot88]

Originally Posted by Yamamaya42

yes, a faint line in the center, a weak horizontal output tube is the first suspect.

A 'quick & dirty' test for a borderline HO tube is the "seven seconds off" test. Turn the set off for 7 seconds, then back on. If the width is slow to fill back out, the tube is borderline. Same test will show up other borderline/weak tubes like H oscillator, vert out, color oscillator, RF amp etc.