DuMont RA-103 Doghouse lives . . . kinda.

[bigaudioal]

Well after a bit of work here and there over the last few months I finally powered up the Doghouse. I replaced all the electrolytics, all bypass caps (except for micas and about a dozen small, little ceramic pf caps. Also replaced all resistors higher than 1 watt.

Slowly powered up on a variac and got a raster, messed up picture and good sound. Good first power up result for my third project. After tweaking I was able to get a picture that looks ok at the very top and then is severely stretched at the middle and bottom. So I went through the vertical and replaced ALL resistors and any small ceramic pf caps. Well, no change. Below photos show what I have.

Note - I am using a 12KP4 CRT (no ion trap needed) instead of the original 12JP4. Not sure this would be causing any of these these conditions? The picture will not fill out on the right side in addition to the obvious vertical issues. I have the yoke as far forward against the bell of the CRT as it can go. If I slide it back, the picture shrinks away from the top right side. Almost like if the yoke could come farther FWD it would fill out.

I will continue testing and replacing resistors and those small ceramic pf caps, but was hoping to see *some* change after doing this in the vertical circuit and saw no change.

I am going to ohm out the VOT and if that checks out, maybe pull the yoke and test resistors in there/replace any caps.

Any ideas??? Do I appear to be on the right track (VOT and yoke)? Only my third set working on it all by myself - so my diagnostic skills based on what I am seeing are not great yet. Set runs solid (well over an hour combined last night), even with the picture like this. Sound is great and all controls seem to function.

The GEICO GECKO sure looks funny this way. More like a velociraptor in the second photo!!!!