[ARC5] SCR-522 Project: Finding Bad Bypasses in 20 Minutes.

[Robert Downs]

I personally don't subscribe to the gut it and rebuild it philosophy of some
of you, but that's neither here nor there.  When testing capacitors, and
especially electrolytic, be sure to use the allowable leakage limits that
were current when the capacitors were made.  If you use current specs,
you're wasting your time to bother to test them, because brand new out of
the factory, they would have failed.

Robert Downs


-----Original Message-----
From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On
Behalf Of Richard Knoppow
Sent: Friday, June 29, 2018 14:51
To: arc5 at mailman.qth.net
Subject: Re: [ARC5] SCR-522 Project: Finding Bad Bypasses in 20 Minutes.

     To repeat something that has been said many times, if the 
bypass and coupling capacitors are paper and are old they _will_ 
be bad.  How bad depends on age and the amount of DC voltage on 
them as a ratio of the rated voltage. Some are better than others 
but all degrade with time. Since moisture in the element is a 
contributor various schemes have been used to avoid moisture. The 
best seem to have been the oil filled variety but those don't 
last forever either. The problem is the degradation of the paper. 
Its an effect similar to the browning of newsprint.
-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL
______________________________________________________________
ARC5 mailing list
Home: http://mailman.qth.net/mailman/listinfo/arc5
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:ARC5 at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html