[Amps] PS filter caps

Glen Zook gzook at yahoo.com
Sat Jan 5 14:40:58 EST 2013

Newer electrolytic capacitors are considerably smaller in physical size and are, generally, of considerably better quality than the older capacitors.  Going to 105-degree capacitors than the original 85-degree capacitors does give an improved margin of safety.  The tolerances of "modern" capacitors are also generally considerably better than the originals.
Glen, K9STH

Website:  http://k9sth.com

 From: rick darwicki <n6pe at yahoo.com>
To: AMPS <amps at contesting.com> 
Sent: Thursday, January 3, 2013 9:39 PM
Subject: [Amps] PS filter caps
I have an old HT-41 apart, it has the original filter caps. I brought it up slow and got the filter caps to level out and they appear OK. I took them (6) out individually and charged and discharged them on a regulated 450 v supply and I'm seeing between 1 and 4 ma leakage but it seems to be going down the more they are under power. They have 20K equalizing resistors across them.
The original caps are about 4" x 1" and rated 100 ufd / 450 v / 85 degree
The guy I'm working on it for gave me some new caps that are 1-3/8" x 3/4"  105 degree 100 ufd 450 v.
Any opinions on if the smaller caps can handle replacing the old ones or should we look for bigger cans? 

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