Quote:
Originally Posted by Alex KL-1
The potmeter was there for factory adjustments to compensate for CRT variations, but it seems that you got a CRT with optimum focus voltage just right with the supply value, so is not really necessary if is working well at the moment. The issue will be only in the future, if CRT changes a little, then will not have how to readjust it.
That said, probably the CRT stands with the current value for years.
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I got a little fatigued on this project and put it aside for awhile, but I have a moment to look at it again, and I realize that the focus could still be better if I have to admit.
I looked into other ways to improve focus, and
I ran across a thread on this forum talking about lowering the G1 voltage (ideally making it negative) to improve focus.
Looking at my schematic, it looks like the G1 is set to 38.2V, and the G2 is set to 307V. The focus range is 0-530V, but it's got those "steps."
Do you think perhaps I could improve focus by sticking a pot on the G1 and lowering it closer to ground?
Wondering also if it would damage anything to do so.
