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My tube does not have "minor focus issues" or convergence issues. It has
absolutely perfect focus and convergence. It probably does have a minorly
weak red cathode. However I just looked at the data sheet for the 15GP22
which says that the red gun can need 4 times the current of the green one,
per spec, and given the voltage-current curves for similar tubes mine is
in that range.
I think I will install the 100K series resistors and use it only on special occasions.
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