Width & Focus in DuMont RA-103

[Phil Nelson]

If y'all are talking about the largest gap shown in my gun photo, both of the pieces on either side of the gap are angled, if that means anything. It's not easy to see in the photo.

Meanwhile, I put the trap back on and fiddled some more. With the magnet rotated to the opposite side of the neck (opposite from the earlier photo), the picture is bright, even with the focus coil made perpendicular as it should be. (Maybe I unknowingly reversed it the other way, too. I didn't mark anything before, and the trap looks identical both ways.)

The trap has to be all the way back to the tube base. Any farther forward, and there's no picture.

Anyhow, now the coil isn't cockeyed and I can get good focus closer to the midpoint of the focus control's travel. Maybe I'll call this good enough.

An additional nit I didn't mention before is that there is slight horizontal "trailing" in high contrast lines. If you look at the very first picture in this thread, it's especially obvious in the E in PAUSE. Horizontal lock is very stable, and moving the horiz hold control doesn't affect this.

I tried the width adjustment again, but still no joy there.

Phil