[dtvmcdonald]

ElectronicM, your post reminds me: the other method I mentioned should
also work.
Just consider "half" instead of your 2. That is, cut the present horizontal
output tube in half, or remove half the cathode. . For the same grid input, the
output current would be cut in half (at saturation that is). The other tube
I suggested isn't quite that, but its saturation current is half.

The other thing to think about is .. what happens when the
main HV rectifier's filament dies? the load on the output tube and the
transformer goes way down, and I suspect that the pulse
voltage goes way up. This of course actually does happen.
What I'm worried about is really only the output transformer.
The convergence transformer is immaterial, it could just be disconnected.

The alternate tube I propose might generate a bit too little drive for the
AGC and sync windings to funstion properly.