CBS Columbia

[zeno]

Originally Posted by Electronic M

It could also be a horizontal drive line, caused by an incorrectly set horizontal drive control.

If the line is kinda shimmery like it has white noise in it then it's barkhausen and might be fixed with a well placed magnet on the H output tube.

No picture=guess work diagnosis.

Yes but if its a true drive line / fold over I would track it down or you may
eat up the H out. Barkhausen & snivets are quite distinctive. Magnet works BUT!
The shop bought out a Radio Shack clone store. They got loaded down
with IEC & Raytheon ( red arrow ) tubes, probably 1000 of them. Cost us 5 cents each. Every H out had problems especially barkhausen. Along
with that there were JA, Euro & one chassis US tubes that were useless.
In the end 5 cents was no bargain !
So bottom line is buy real NOS tubes from real TV makers. Watch out for rest
restuffs, a lot of shops did that. Same with modules. I bet half the
boards on E-bay are duds never returned. The sellers are seldom the
original owners. They are just selling off a clean out & wouldnt know
a dud from a new or rebuilt board. And not GAS.

enuf fer now
73 Zeno
LFOD !

[Penthode]

Adjust the hold control while maintaining sync. If the faint line moves in the opposite direction to the active picture, then the line is due to sync waveform edges being displayed during horizontal retrace.