PICKING CAPACITORS

[Hoerninger]

http://www.reliablecapacitors.com/pickcap.htm
(Many figures at the bottom.)


__________
Peter

[4313B]

Yeah, I like their PPT Theta's and RT's as bypass capacitors.

[Hoerninger]

http://www.humblehomemadehifi.com/index.html
CAP TEST:
http://www.humblehomemadehifi.com/Cap.html

[JBL 4645]

I haven’t played around with capacitors in years now not since I had CB radio where I could solder a different (microfarad value) to get the "Roger Bleep" on my "Cobra 148 GLT-DX" to have a slightly longer delay that LOL cursed the fuse to short out LOL oh those where the days of experimenting.

With crossovers I haven’t yet mucked around and I sure as hell don’t what to blow anything up unless its already been tried out.

If you what to have some lazy fun with the capacitors take a pair of pliers place a capacitor in-between the pliers take a lighter and hold the flame underneath the capacitor. The bigger the capacitor the louder it will be! Just remember to ware a mask these smell bad!

[JBL 4645]

http://www.humblehomemadehifi.com/index.html
CAP TEST:
http://www.humblehomemadehifi.com/Cap.html

This is a good fascinating read I’m thinking of hooking up the other JBL for an experiment if I can find some cable that is long enough I’m very short on cable at the moment.

http://www.humblehomemadehifi.com/Serious-Sub.html

[greyhound]

vibrations inside the capacitors seem te have impact on the overal sound.

usualy the carbon based capacitors sound the best.
but you can upgrade your capacitor
like this

http://www.dhtrob.com/keesolaf/elco.htm

after putting it in a wooden case use laquer on a natural base (schellac, C37) to get it airtight.

also dipping them in beewax gives improvements

[JBL 4645]

vibrations inside the capacitors seem te have impact on the overal sound.

usualy the carbon based capacitors sound the best.
but you can upgrade your capacitor
like this

http://www.dhtrob.com/keesolaf/elco.htm

after putting it in a wooden case use laquer on a natural base (schellac, C37) to get it airtight.

also dipping them in beewax gives improvements

Are you saying by de-soldering the type of specific capacitors that the manufacture specified for certain products and by replacing it with a different grade will make a noticeable improvement in performance?

[hjames]

Are you saying by de-soldering the type of specific capacitors that the manufacture specified for certain products and by replacing it with a different grade will make a noticeable improvement in performance?

Ah c'mon Ash ... this is BASIC stuff.
Manufacturers pick caps (brands/quality) based on PRICE POINT ...
in older speakers caps have AGED and may no longer be in spec.

To get better sound, replace old caps with better speced parts -
and as G err , 4313B says, replace old crossovers with CC version for improved sound ...

[greyhound]

Are you saying by de-soldering the type of specific capacitors that the manufacture specified for certain products and by replacing it with a different grade will make a noticeable improvement in performance?

well im a carbon freak
capacitors on a oil carbon base improved my sound considerably.

the vintage equipment (in my opinion) has more character than modern stuff.
a friend of mine replaced all resistors that were carbon based with metal films. we compared and now hes soldering everything back.
but technicaly it measured better. but the old amp lost its soul.
the 1801 poweramp by bose.

in speakers and also cd players ive got improvements.
i dont understand what you mean by grade
the specifics should be the same but the brands are different.

this is also the case with coils. remove the ferriet/iron core and make them bigger. so teh centre is air.

[Doctor_Electron]

"If you what to have some lazy fun with the capacitors"

Try this... Take a 120 uF /50 WV, wet-slug tantalum electrolytic and plug it backwards into a test bench (U.S. Navy repair shop) 28 VDC receptacle. Then after ten seconds or so, get nervious about it all and swat it out of the receptacle with a foxtail brush.
If it's as much fun as my stunt turned out to be, it will violently explode, ala' a freshly made M-80, about six feet from the receptacle, and smell EXTREMELY toxic.
Didn't seem quite so funny at the moment, but it did (and I mean DID) get the full attenton of everone in the shop.
We afterwards tried (via remote conrol power-on, safer (?) to replicate those results, but to no avail!

[greyhound]

"If you what to have some lazy fun with the capacitors"

Try this... Take a 120 uF /50 WV, wet-slug tantalum electrolytic and plug it backwards into a test bench (U.S. Navy repair shop) 28 VDC receptacle. Then after ten seconds or so, get nervious about it all and swat it out of the receptacle with a foxtail brush.
If it's as much fun as my stunt turned out to be, it will violently explode, ala' a freshly made M-80, about six feet from the receptacle, and smell EXTREMELY toxic.
Didn't seem quite so funny at the moment, but it did (and I mean DID) get the full attenton of everone in the shop.
We afterwards tried (via remote conrol power-on, safer (?) to replicate those results, but to no avail!

[Hoerninger]

AES-Paper:
Menno van der Veen "Non-linear distortions in capacitors"

http://www.mennovanderveen.nl/nl/downloa/download_4.pdf
____________
Peter

[Hoerninger]

National Semiconductor (Bob Pease):
http://www.national.com/rap/Applicat...570,28,00.html




Further reading by Bob Pease:
http://electronicdesign.com/Articles...ArticleID=6096
___________
Peter

[Hoerninger]

http://waltjung.org/PDFs/Picking_Capacitors_1.pdf

http://waltjung.org/PDFs/Picking_Capacitors_2.pdf
______________
Peter

[Hoerninger]

Understanding Dielectric Absorbtion by Sencore
http://www.sencore.com/uploads/files...Absorption.pdf

easy to follow, some figures for illustrating - refering to the graphs of National Semiconductor
____________
Peter