- Nov 16, 2021
This is certainly true.As a matter of fact, old electrolytic capacitors DO leak and ooze a physical substance (in addition to let pass electrical current). Le liquid electrolite inside dries with age , taking more space. It then beggins to push through the safety hole under the sealing rubbery seal at the positive side of the cap, causing a bubble, which finally blows up, letting a (often whitish, but not allways) powder to come out.
Set of original electrolytic capacitors from a 1974 fender Silverface guitar amplifier.It's a full set of five filter caps , all that are in the 'dog house' of the amp.One of the 20MFD cover is a bit peeled, it's ok on the other side as it can be seen in the picturesThese are vintage *non functio...reverb.com
But they can start "leaking" DC long before they start leaking goo.
They always start leaking DC.
They sometimes ooze.
My point was to possibly save someone some heartbreak by teaching them that there is no reliable visual check for caps.