I don't what the differences are between the H81 and HX81 series, but I do have the H81 service manuals available for download at my website. Toshiba Tips & Tweaks
Thank you all. I got the 50H81 from the keohi website. It is the same as the 50HX81.
For starters, I did the 56-pt convergence, basically to correct minor flaws in geometry, especially the edges. To the naked eye, the geometry is almost perfect now.
The colors look ok, but of course I will never know what is perfect until I reference it with an established standard
When I get more adventurous, I will do the other things. I am just waiting for my Video Essentials to arrive.
I plan to plot the grid convergence template next week using our plotter at the office.