Hello Corby, I keep my HP5065A powered on 24/7 with UPS backup. Like John, I compare it once or twice a year (to a Thunderbolt running Lady Heather) and adjust accordingly. I have modified the C-field adjustment for higher resolution, original (coarse) control is now under the hood and the fine control is mounted in place of the original Knobpot. Unit has been running continuously for about 5 years. Don't have any history before my acquisition of the unit. I did have one of the cheap PC mount pots on the 10811 motherboard fail several months back. That repair did interrupt power of course. Regards, Skip Withrow
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