Finally...something like success

[ggregg]

I have a DuMont RA-109 that I have been working on for the last couple of months. I've replaced every electrolytic and paper cap and while I had a working (although very weak) 19AP-4, I just could not get it to lock up. Last week, a fellow collector contacted me regarding an RA-112 he has that he had no use for anymore. He said the 19AP-4 was good (very good as it turns out). To make a long story short, I finally decided to go back and check my work on the filters. One 10mfd cap was shorting to a resistor lead. I pulled the leads apart and put the chassis back in the set. When I turned it on, the picture was immediately stable, albeit way out of adjustment. I adjusted the yoke as best I know and everything looks good except the bottom of the picture is somewhat stretched out while the top is compressed. Time to go back to the books and find out what needs to be adjusted now or if I still have some issues someplace. Comments are appreciated.

[ggregg]

After playing with the yoke some more and adjusting the vertical linearity, I got this. Getting pretty close.

[bandersen]

Look like you've just about got it squared away. Nice job!

[Kevin Kuehn]

Looks pretty good from here too.

Kevin

[ggregg]

Thanks alot guys. Haven't done a TV since 1998. Now I have a 16" porthole and a little Admiral in line. Don't know if this DuMont was the one to start with. Holy cow, these have a lot of caps. But I'm pleased with the result and now remember how important it is to recheck your work. Here is a picture of the case again, which was the main reason why I bought this.

[Kevin Kuehn]

Originally Posted by ggregg

Here is a picture of the case again, which was the main reason why I bought this.

That's a real beauty.

Kevin

[jeyurkon]

Looking really good!

[Dan Starnes]

Looking good.