[Adam]

Made some progress on this set tonight. I put in the new correct yoke, and still had the same problems as before, but noted that the 5U4 was glowing excessively bright as well as the damper tube. It turns out the filament winding for the damper tube was arcing inside the power transformer, either to the 5U4 filament winding, or main secondary windings. I had dismissed the idea of a short in the power transformer being a problem when I tested it for shorts and found nothing, but even though it's not actually shorted it appears something is arcing in there when it's working. I powered the damper tube filament off a separate transformer, and pulled up this blank raster. I still have no picture or sound, but at least I got HV.

This set sure needed a lot of new parts. The power trans must have been the original cause of this set's problems, but it burnt out the lin coil, and caused someone long ago to replace both the yoke and the fly (with the wrong ones!) and then loose the hv filter cap. At least the 16GP4 is still good (the brightness isn't up all the way in the pic)