Convergence issues. - Videokarma.org TV - Video

Big Dave · #1 02-19-2005, 08:20 PM

I have tried to get good convergence on my 16 and have failed miserably. I've been using a VCD I made up of color bars, crosshatch and an indian head test pattern (different from the one on Chuck Pharis's site). For the most part, I can get center decent. Top and bottom are also decent, but left and right R/G vertical lines don't come close. It's throwing a bunch of other stuff off. I can't see the misalignment that well with the crosshatch, but I sure can see on regular broadcast. I am going to replace the selenium pack with silicon diodes (might solve the problem). I placed the convergence yoke, putiry rings and blue lateral magnet back on the tube according to the clean areas on the neck (I didn't clean the tube off when I swapped out the cabinet).

What is the exact placement of the elements on a 21FJP? I have experimented with different positions and have it "almost right". When I went to adjust purity, turning the rings actually threw the convergence off. So, in addition to rotten convergence, I also have rotten purity. I know I sound like a total idiot, but I never could get a decent convergence on any color set I ever had. Any help is greatly appreciated.

Steve K · #2 02-19-2005, 08:48 PM

Dave:

Here is a chart showing the placement of the components on the neck of the picture tube.

Steve

Big Dave · #3 02-19-2005, 10:26 PM

Thank you, Steve. This will help immensely. I'll resume work tomorrow. Right now... it's Miller Time.

Big Dave · #4 02-20-2005, 07:26 PM

I did what the pic said and finally got decent convergence. It's not perfect, but it's very viewable. For your entertainment, here's a pic of Meathead calling Archie names.

Steve Hoffman · #5 02-20-2005, 08:02 PM

Quote:

Originally Posted by Steve K

Dave:

Here is a chart showing the placement of the components on the neck of the picture tube.

Steve

Steve,

As much as I love old Roundies, the Sony Trinitron sure was a blessing...

Steve K · #6 02-20-2005, 10:57 PM

Dave:

Nice job! With a little practice convergence gets a lot easier. There was a time I could converge a set by watching an off air show with the color turned down. That was a long time ago though and at the time I only worked on Zeniths.

Steve:

A Sony Trinitron? Still not as good as my CT-100!

Steve

Steve Hoffman · #7 02-21-2005, 01:22 AM

And not as cute as your old B&W set (now mine..)

Sorry for the digress, back to convergence!

reeferman · #8 02-21-2005, 10:08 PM

In my experience with roundies (while working at an independent tv shop in the late '60s), the CTC-16 was the least likely chassis to obtain good convergence, especially on the right side. No matter what. Good job!

Big Dave · #9 02-21-2005, 10:25 PM

Thank you all. I am calling this finished for now. When i switched cabinets, I never looked to see if the screws for the tuner mount were there. I have to go north and swipe the ones from the other bezel. For now, I have to change channels from the back. With all the feedback I have recieved about the cabinet, I have decided to keep it, despite the bad areas. I will keep the other and if i find another 16, I'll use it.

I will post a finished picture as soon as I can get what I need.