Besides the effects on the metering, you may want to check the power rating of the volts pot. The original 100 kR value would dissipate about a watt at full output, now about 2 W with 50 kR. If these pots are the big old-school 2 inch diameter types, it should be no problem, but the modern smaller 1 inch ones I think are rated only about 1-2W. That could be why the note was left, to consider it.
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Ed
