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<DIV dir=ltr align=left><SPAN class=760010019-03022016><FONT color=#0000ff
size=2 face=Arial>I've read all these recapping posts with interest, but I gotta
say, I avoid using electrolytic caps except for power rail decoupling
purposes. I never design them into actual circuits (and I've never
built my own power supply). Same with tants.</FONT></SPAN></DIV><BR>
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<FONT size=2 face=Tahoma><B>From:</B> Synth-diy
[mailto:synth-diy-bounces@dropmix.xs4all.nl] <B>On Behalf Of </B>Chris
Juried<BR><B>Sent:</B> Wednesday, February 03, 2016 8:39 AM<BR><B>To:</B>
Steve Ridley; synth-diy@dropmix.xs4all.nl<BR><B>Subject:</B> Re: [sdiy]
capping<BR></FONT><BR></DIV>
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<DIV dir=ltr id=yui_3_16_0_1_1454512801550_18862>FYI, Excellent read by
Douglas Self on Electrolytic capacitor non-linearity... <A
id=yui_3_16_0_1_1454512801550_18860
href="https://books.google.com/books?id=u249BAAAQBAJ&pg=PA71&lpg=PA71&dq=self+dc-blocking+electrolytic+distortion&source=bl&ots=zMONtIOWnJ&sig=IS2A60Ve9AWEFbfbj_JsFYfUQXY&hl=en&sa=X&ved=0ahUKEwj8hr-6uNnKAhVDyWMKHT9aDcMQ6AEIMDAD#v=onepage&q=self%20dc-blocking%20electrolytic%20distortion&f=false">https://books.google.com/books?id=u249BAAAQBAJ&pg=PA71&lpg=PA71&dq=self+dc-blocking+electrolytic+distortion&source=bl&ots=zMONtIOWnJ&sig=IS2A60Ve9AWEFbfbj_JsFYfUQXY&hl=en&sa=X&ved=0ahUKEwj8hr-6uNnKAhVDyWMKHT9aDcMQ6AEIMDAD#v=onepage&q=self%20dc-blocking%20electrolytic%20distortion&f=false</A>
</DIV>
<DIV id=yui_3_16_0_1_1454512801550_18806><SPAN></SPAN></DIV>
<DIV id=yui_3_16_0_1_1454512801550_18811> </DIV>
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<DIV id=yui_3_16_0_1_1454512801550_18808><FONT
id=yui_3_16_0_1_1454512801550_18807
size=2>Sincerely, <BR> </FONT></DIV>
<DIV id=yui_3_16_0_1_1454512801550_18867><FONT size=2>Chris Juried
<BR>Audio Engineering Society (AES) <VAR
id=yui-ie-cursor></VAR>Member <BR>InfoComm-Recognized AV
Technologist</FONT><SPAN class=postbody><BR><A
href="http://www.juriedengineering.com/" rel=nofollow
target=_blank>http://www.JuriedEngineering.com</A> (Juried Engineering,
LLC.)<BR><A href="http://www.tubeequipment.com/" rel=nofollow
target=_blank>http://www.TubeEquipment.com</A> (Tube Equipment
Corporation)<BR><A href="http://www.historyofrecording.com/" rel=nofollow
target=_blank>http://www.HistoryOfRecording.com</A> (History of
Recording)<BR></SPAN><A href="http://www.linkedin.com/in/chrisjuried"
rel=nofollow target=_blank>http://www.linkedin.com/in/chrisjuried</A>
(LinkedIn)</DIV>
<DIV id=yui_3_16_0_1_1454512801550_18869><FONT size=3><FONT
size=2><B>Email:</B> <A href="mailto:CJuried@yahoo.com" rel=nofollow
target=_blank>CJuried@yahoo.com</A> <BR><B>Voice:</B> (954) 478-4355
<BR><BR><BR>This e-mail, and any attachments thereto, is intended only for use
by the addressee(s) named herein and may contain legally privileged and/or
confidential information. If you are not the intended recipient of this
e-mail, you are hereby notified that any distribution or copying of this
email, and any attachments thereto, is strictly prohibited. If you have
received this email in error, please immediately notify me at (954) 478-4355
and permanently delete the original and any copy of any e-mail and any
printout thereof.</FONT></FONT><BR></DIV></DIV><BR>
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<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Steve Ridley
<spr@spridley.freeserve.co.uk><BR><B><SPAN
style="FONT-WEIGHT: bold">To:</SPAN></B> synth-diy@dropmix.xs4all.nl
<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Monday, February 1,
2016 5:54 PM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re:
[sdiy] capping<BR></FONT></DIV>
<DIV class=y_msg_container><BR><BR clear=none>I can see why recapping causes
such mixed opinions. On one side, it makes sense if you know what you're doing
overhauling or repairing for a customer, but when it's done "because everyone
says you should do it" and the replacement caps are cheap ones with a worst
case life of 1000 hours it's can be unnecessary vandalism. Recapping has it's
place, but should be done when necessary, not as a random act of
maintenance.<BR clear=none><BR clear=none>Not all caps deteriorate at the same
rate. Type, make and position can make a huge difference. A cap next to a hot
power device is likely to deteriorate much sooner than an identical cap
elsewhere. Certain makes of cap have a poor reputation, but knowing which ones
comes with time and experience. One bad cap doesn't mean they'll all be bad. I
like to know what's going on before I consider recapping.<BR clear=none><BR
clear=none>Some ESR meters will test caps in circuit. I use a Dick Smith ESR
meter, now discontinued, but EVB and Anatek make very similar models. They
will give a useful indication of the state of a cap without removing it from
the board, although multiple caps in parallel or shorted caps will give a
false good reading. <BR clear=none><BR clear=none>The other important tools
are your eyes and nose - look for staining at the end of the cap. Leaky caps
have often have a distinctive acrid fishy smell - a real giveaway.
<DIV id=yqtfd66831 class=yqt4501144702><BR clear=none><BR clear=none><BR
clear=none>Steve<BR clear=none><BR clear=none><BR clear=none><BR
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