[Eliot Ness]

The easiest way to check the caps is with an older capacitor tester that can place the cap under load.  The vintage Sprague, Heathkit, and Jackson capacitor testers will test leakage with anywhere from 400 - 600 volts (real life working volts), something those modern handheld Chinese units can't do.

I've been using an old Jackson 650A for years (with a Heathkit as backup):

http://www.californiahistoricalradio.com...hould-own/

The Sprague Tel-Ohmike are considered the Cadillac of vintage capacitor testers by some, but they usually sell for a premium price and one of the lesser names will serve you just as well.

http://boatanchorpix.x10host.com/CapChkrs.htm