[dtvmcdonald]

You are right about the 2000v focus ... its very wrong. The resistor
chain values on the schematic give more like 1400 and result in
correct focus near the center of the control.

I changed all the resistors to modern carbon ones, using two or three
2-watt ones in series for each of the originals to get enough voltage
rating.

I have no idea if this helped, however.


That's because I discovered that the focus wire to the
original socket was open. It was NOT OPEN yesterday morning, because I
measured it when making the adapter for the radar tube. But it
sure is now. How can a wire go open? This is not a small gauge wire,
its like #22 stranded. I did not cut open the bundle it is in but replaced
it with a new HV wire cable-tied to the bundle.

I did cut about 1/2 inch off it at the socket end and 2 inches inside
the chassis. I stripped the ends expecting to find that the shortened
wire was OK. No, its open. How can such a wire be open?

In any case the set now produces a quite nice picture. Its not without
defects. First is what looks like interference but probably
is beats between the audio and color carriers. I've got to figure
out where the audio trap is and check its adjustment.

Second is blurring due to too much capacitance from the grid lead.
This varies with placement. I will make new cables with 0.005 inch
wire, and also make spacers to keep it away from the rest
of the bundles.

Other than that, the set now works correctly.