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a old school cap tester is a good piece of gear to have, both for checking eletros and lossy film types. The dipped types (brown orange maroon) often test fine for leakage, but not so for values. They show up on the tester as a eye that does not fully open or has fuzzy edges. Heat seems to have big effect as well when they are bad.
I also check anything going in as a replacement. I have caught at least once my self installing the wrong value. Goes like this, I lift a leg test it, dial in the correct value, eye does not open up as it should. Remove the old part, get ready to install the new one, but put on the tester, hmmm thats odd its not opening at all. Ah Ha, I have a .01 not a .001, by leaving the tester dial in the orig position used to test the old cap it caught me try to replace it with a cap off by a factor of 10.
other cap tester oddness, disconnect any RF leads, I had a DVD player hooked up to a set, and turned on. Set is off and unpluged, lift one leg to test test bad (fuzzy eye on value test) take out of circuit test again, test fine. hmmm put back in, fuzzy eye, disconnect the DVD, and all is well.
make sure cap tester case is isolated from the metal chassis of the set, did not do that once and a cap kept testing as leaky. Not sure why but the cap tester was in contact with the TV chassis. moved it and everything tested normal.
stuff happens....
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