02-06-2017, 06:35 PM
When the line voltage is on the high side, I would be more concerned about the power transformer than the tubes. Philco radios, for the most part, have pretty robust transformers, therefore, not so much of a problem. Not so with some of the other brands. High line voltages can cause the power transformer to saturate, leading to very high operating temperature.
Steve
Steve
M R Radios C M Tubes