Mac's Service Shop: Shelf Life of Capacitors & Batteries

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Mac's Service Shop: Shelf Life of Capacitors & Batteries

by KirtB » Mon Jul 24, 2017 1:12 pm

Mac's Service Shop: Shelf Life of Capacitors & Batteries

One of the first things a knowledgeable restorer of vintage electronic gear does prior to plugging in a newly acquired piece of hardware is to replace all of the original paper capacitors. Those things notoriously loose the internally contained smoke that makes them work soon after power is applied. Episodes of conflagration often ensue. According to Mac McGregor, the typical shelf life of a paper capacitor (and some mica and ceramics back in the day) is about five years. In that time the insulation resistance can drop from 5000 MΩ to less than 2 MΩ. Ohm's Law quickly reveals that with used across... http://www.rfcafe.com/references/popular-electronics/macs-service-shop-shelf-life-capacitors-batteries-popular-electronics-august-1972.htm

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