Tweet
In reply to MarkusBass; My meter has variable frequency. My test method is to set the frequency to the point where the ESR drops to its lowest level and this eliminates the capacitive (f=too low) and inductive reactance (f=too high) clouding the results. If my frequency was incorrect I would have a high reading on the Mallory, too. late on yesterday I tried charging the JJ cap to 480v and afterwards the reading dropped to 0.82 ohms and reads the same this morning. Still not as good as a 40-year-old Mallory that's been in my scrap box for 10 years, but it does perhaps go some way to explaining why JJ caps are fine when installed. I use them all the time and have never had cause to doubt them - just buy 'em and fit 'em.
Comment