[Steve Davis]

It is hard to tell from the photo, but the yellow cap is probably replacing one section of the filter cap or connected parallel to one section (not a good idea). To keep things simple, you can use three 10uf caps to replace the 8uf/8uf/10uf. All negatives go to the HV center tap, one positive will go to one side of the field coil, another positive will go to the other side of the field coil, the last positive will go to chassis ground.

Steve