high ac voltage destrucive or not?

If you have tube equipment, the higher voltage can place your biased tubes close to their operational limits and some of the capacitors can also be at risk. Normally, I would say "don't worry too much" but you willo certainly experience a bit of lessened life expectancy with tubes. Similar to light bulbs, the turn on surges are the most difficult to handle and I would imagine that in your home, lioght bulbs last a bit less than normal. Excessive low voltages can cause simialr difficulties,making motors in fridges and other major appliances work outside of their peak efficiency range. Normally, things are designed to work with about a +/- 10% from ideal rated voltages.

Did you take you voltage readings with a load on the circuit? Especially The Powervar. Turn on all your equipment, then take a voltage reading at the wall outlet and the output of the Powervar. Let us know what the readings are then. Also when was the last time You had the Fluke calibrated for acuracy. It could be off 2 or 3 volts, maybe more.
One way you can usually tell if you have higher than normal voltage is you are constantly replacing light bulbs.

Jim

hi jim I just measured the wall outlet at 125.6 and the powervar at 128.2, im thinking the powervar is not working correctly? Is it time for a new power conditioner,thanks