Re: CRT is brighter to one side [Hitachi CTP213]
You're not asking silly questions! C738 appears to be connected to the 110Vdc main supply rail. It's function is to decouple any line frequency pulses that may appear on the supply from the line driver stage as shown in the thumbnail diagram. R725 next to C738 drops the 110v supply to the driver stage T703. R725 will run warm. C738 looks like a 100uF at 160Vdc.
I'm not sure what test gear you have, but a check on the base and collector voltages of T703 would reveal if there is an obvious problem in that area.
Again, switch off, unplug, wait, then connect a meter to the transistor. Then switch on and take note of the readings. Don't take use a meter probe with the set on, you'll end up with a shock. Connect/disconnect with the set off.
Some really clear pictures of the screen, with the phone looking directly at the screen would help. Distortions of the picture help us know what bit of the set is at fault. So a good straight view of the screen is good.
If you do not feel confident at this then please don't go any further. SJM
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