Admirial 30A1 white vertical stripe

[mepurina]

Problem Solved!!!!!!
I traced the distorted signal all the way through the IF to the Tuner.
I found that the power to the tuner had the same distorted pulse that the video had.
I traced the tuner power to the power supply chassis. At that point I knew what the problem was.

This set has a separate duel power supply that sits under the main chassis.
One High voltage supply supplies power to almost all of the main chassis for IF, Video, audio, sweep and High voltage circuits. Everything but the tuner!

The second supply supplies power to the audio amp (which is also on this chassis with a socket for a plug in speaker) and also supplies power to the three vacuum tubes on the tuner.

The speaker on this set uses an electromagnetic coil, not a permanent magnet. The coil also acts as a filter for the low power supply. Without this coil plugged in with the speaker that is mounted in the cabinet, the power to the tuner is unfiltered with this pulse that caused the white bar in the video signal.
I really screwed up and forgot about this coil and have been chasing a non problem for over a week. Live and learn.
Thank you all for your help and keeping me going on this crazy problem. I learned a lot from you guys while chasing down the problem . I could not have fixed it without you.

The picture is nice and bright without the white line as long as it is in the cabinet.
I still have some horizontal linearity issues but I can live with that for now.
Thanks again

[Electronic M]

A good lesson to always connect field coil speakers and any speakers that mount the audio output trans to the speaker frame...Those sets sometimes use the audio stage in place of a B+ voltage dropper and if you remove plate bias from the audio output tube other stages fed dropped B+ by the audio output cathode suddenly have no B+.