Picture tube substitute

[cademan]

Not sure if this is the right place to ask but does anyone know of a color picture tube substitute guide or link?

I have a LXI tv with a fairly good picture tube except it is darker than normal probably due to wear and when the brightness is turned up, the picture washes out. Plus someone scratched the front somehow right in the middle of the view area

The LXI tv tube number is: A68ACTOOX

If at all possible, I would like to use a good Fisher tv picture tube with the number A68ACC35L.

I have visually compared the two and the connections are identical along with the internal connections but operating voltages may be different.

Any help is very appreciated!