I have found, over the years, that carbon comp resistors go high. In some
restorations, especially on radios that you just want to function, I leave
the resistors alone, where they have increased in value moderately. My
reasoning is that since the line voltage is higher now, a reduction in
voltage caused by the higher value resistors, will somewhat compensate for
the increased voltage. This would especially apply to screen and cathode
resistors.

However, in critical work, it may pay to pay attention to the resistors. My
Collins receiver uses a bridge circuit for the S-meter and the zero point
kept changing. At first I thought it was a leaky capacitor. I checked,
then finally replaced them. No improvement. I then carefully checked the
tubes. No improvement. Finally, I replaced the carbon comp resistors with
stable ones and the meter drift was cured.

73, Colin K7FM