Dumont RA-110 from ETF

[earlyfilm]

Originally Posted by Kamakiri

. . . . width. I can get it wider, but then I have to max out the horizontal drive and the whole picture darkens up in the center. . . . .

After tubes, the first thing I'd check would be the cathode resister on the horizontal output tube.

If your other checks do not find the problem. . . .

I notice that the Sam's that you are using lumps the 12 inch RA-103 with the 19 inch RA-110 chassis. I see that Rider keeps them separate.

I have no idea what Du Mont changed (other than the yoke) for the bigger CRT, but there is a slight chance that the person who recapped your set used the more readily available Sam's instead of either Du Mont or Rider diagrams and accidentally created an image size problem.

Jas.