You guys have anticipated a question I was going to post today. My ARTsa is equipped with KT120s, four per channel. I live in West Palm Beach, Florida, and especially in the summer months, Florida Power & Light increases the line voltage on the grid during the hottest part of the day. The bias LEDs come on when that happens. Jeff at CJ told me not to worry about it, to just ignore it when this happens. So I have and had no problems. Last night I noticed only one, then 2 LEDs on, and since I hadn't adjusted bias in a month or more, decided to do so. Two things happened that prompt this query: First, one of the tubes could not be biased to the point where the LED went out, and second, a great big thump noise came out of my speakers while trying to adjust the bias on that tube. No harm was done, everything sounds OK, and about a half hour later, presumably after FP&L dropped the voltage even the one recalcitrant LED went out. The amp is almost 1 year old and gets used 3-4 hours per day.
Thanks,
Bill
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