Wouldn't be a bad idea to give it a douche. Kinda like greasing the ball joints on a car that's been sitting for 20 years before running it on the cobblestones around the corner.
Keep an eye on the temps of the Can caps. If they heat up (other than radiant heat from adjacent tubes and transformers) shut it down. If you have a variac, I'd try to at least bring it up to wall voltage slow (over an 7-8 hour period) to help the caps form back up. Don't shock them with wall voltage right off, if they are weak they might blow. Dim bulb tester throttles the voltage and the current to reduce damage.
Start at 30 volts and increase 10 volts an hour until you've spent an hour at 90V. Then 1/2 hour per 10volts up to 120V. keep an eye on the can cap temps. If one or all heats up fast shut it down and replace them. Also look for weeping from the center vents on them BEFORE powering up. If they've vented, don't plug it in.
If you don't have a variac, use a 40w bulb for an hour, a 60w bulb x1hr, a 75w bulb x1hr then a 100w bulb x1hr. This does the same basic thing, but a bit faster. Same deal keep an eye on the can caps.
Larry
