I'd like clarification as to what I experience in summer months can harm my amp or the tubes. My wall voltage is typically 122 to 123 VAC. I use a variac and set it for 117VAC both to run and when I adjust the bias. In the cooler months voltage swings are minimal and swings are not large BUT summer time with AC units off and on causes issues. My variac voltage dropped to 115VAC and, obviously, the bias set point dropped and was below the recommend .490 VDC. My variac was maxed out on the dial.
Is there an issue running the amp with the bias below .490VDC?
Is there an issue running the amp with the bias below .490VDC?