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RE: cause of new rectifier valve burning out

Posted by tubular.well (D) on December 9, 2017 at 13:45:07

In Reply to: RE: cause of new rectifier valve burning out posted by Tre' on December 9, 2017 at 09:00:54:

Have a peek at the EZ81 datasheet, here mac input cap is 50uF

https://frank.pocnet.net/sheets/010/e/EZ81.pdf

The reason this ez81 overloaded was most likley an old electrolytic cap
that has de-formed ( lost the isolating surface). This is reversible
providing the electrolytic still is present.
Reforming the cap(s) via en external DC supply and with a resistive
current limiting ( 10k or so) over a period of some hours might
give the cap back to life. Reforming should be gentle, leakage
will heat the cap and if applying voltage to fast, local heating
might permanently destroy the aluminium foil.
If no external DC is available ; then replace the cap(s) in question.

Edits: 12/09/17

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