HammondWiki - Diff: CapacitorReplacement

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-The electrolytic capacitors in old (and new) electronic equipment use a wet dielectric --- they dry out with age. This happen whether in in use, or sitting on a shelf in a warehouse --- in fact, use may prolong their life, see [CapacitorReforming]). They have a shelf-life, usually stated to be on the order of ten to twenty years.

+The electrolytic capacitors in old (and new) electronic equipment use a wet dielectric --- they dry out with age. This happen whether in use, or sitting on a shelf in a warehouse --- in fact, use may prolong their life, see [CapacitorReforming]). They have a shelf-life, usually stated to be on the order of ten to twenty years.

The ''wax-and-paper'' caps also "dry out" and have a similar lifetime.

As ToneWheel Hammonds ([Leslie]s too) are in general, twenty-nine to sixty-eight years old, their caps are long since past their "pull date". Eventually, old caps will cause problems. Possible symptoms range from hum to tonal degradation to explosion and fire. Many feel that the capacitors should be replaced as a matter of course ([PreventativeMaintenance].)

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--JeffDairiki

If you replace a can cap with under-the-hood discrete caps, it would be a good idea, either to remove the cap socket altogether (and plug the resulting hole), or to otherwise disable the cap socket (ThomDay suggests potting with epoxy), to prevent the unsuspecting from plugging another cap (or their fingers).

-Multi section can capacitors in correct values for the many Hammonds and Leslies, including the B3 and 122 style Leslies are available from http://www.tubesandmore.com Good quality made in USA on Malory's old equipment to the same specs. I have used them in several organs and leslies with good results - Jon Peters

+Multi section can capacitors in correct values for the many Hammonds and Leslies, including the B3 and 122 style Leslies are available from http://www.tubesandmore.com Good quality made in USA on Malory's old equipment to the same specs. I have used them in several organs and leslies with good results

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+- -Jon Peters

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+I've written an article detailing the replacement of the can capacitors (and the other electrolytics) in the AO-29 amplifier used in Hammond's M-100 series of spinet organs: [Overhauling the AO-29 Amplifier in the Hammond M-100 Series|http://www.stefanv.com/hammond_ao29_overhaul.html].

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+--StefanVorkoetter

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