Identify old Sprague caps

RE: Identify old Sprague caps, posted on April 23, 2017 at 14:53:37
Triode_Kingdom Audiophile Posts: 10049 Location: Central Texas Joined: September 24, 2006	It's MIL spec, but otherwise the materials look somewhat run-of-the-mill. Could be an excellent sounding cap, only way to know would be a comparison with other types in the same amplifier.

RE: Identify old Sprague caps, posted on April 23, 2017 at 15:58:08
GeorgePope Audiophile Posts: 102 Location: Havant , UK Joined: March 15, 2017	Mixed dilectric , no doubt paper and polyester dilectric with some form of oil or wax impregnation . Probably intended for pulse applications . I can't find anything similar in old Sprague catalogues apart from 282P series , which were can-type caps What is the URL of that database ? george

RE: Identify old Sprague caps, posted on April 23, 2017 at 16:08:56
Triode_Kingdom Audiophile Posts: 10049 Location: Central Texas Joined: September 24, 2006	I didn't save the URL, but you should be able to Google it. Try "CH05A1NF." They're metallized paper with a plastic dielectric. Not sure if a special plastic is used at those temperatures, but it's almost certainly dry or impregnated with a non-flowing binder.

RE: Identify old Sprague caps, posted on April 24, 2017 at 19:15:16

Michael Samra
Dealer

Posts: 36118
Location: saginaw michigan
Joined: January 30, 2005

Those are not a paper cap.Not all caps are that hermetically sealed are a paper dielectric. All Sprague caps that have paper in the dielectric,have a letter P in the part number. Vit Q caps are usually 196P or 176P or 118P which is a paper and polyester dielectric. Even the Sprague Black beauties that are 160P are paper and the 160M are Mylar.Mylar is the fancy name for polyester.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

RE: Identify old Sprague caps, posted on April 25, 2017 at 03:55:59
GeorgePope Audiophile Posts: 102 Location: Havant , UK Joined: March 15, 2017	According to the specs detailed , it's a hybrid metallised paper and plastic dilectric George

RE: Identify old Sprague caps, posted on April 25, 2017 at 04:21:53
Michael Samra Dealer Posts: 36118 Location: saginaw michigan Joined: January 30, 2005	George Where are you seeing these specs? You are right tho in your post below when you said about paper impregnation in that they have to be impregnated in oil or wax if it's paper. "For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

RE: Identify old Sprague caps, posted on April 25, 2017 at 11:37:36

GeorgePope
Audiophile

Posts: 102
Location: Havant , UK
Joined: March 15, 2017

See link .

George

https://www.audioasylum.com/forums/tubediy/messages/25/25483

I have my doubts about that cap being paper and here is why., posted on April 26, 2017 at 22:01:47

Michael Samra
Dealer

Posts: 36118
Location: saginaw michigan
Joined: January 30, 2005

I haven't been able to find that sheet anywhere and it resembles a spread sheet that someone may have made up. Every Sprague cap I own with a paper content,has a P in the number designation. Read this.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

http://www.ebay.com/gds/Identifying-Vintage-Paper-in-Oil-Cap

RE: I have my doubts about that cap being paper and here is why., posted on April 27, 2017 at 05:45:44

GeorgePope
Audiophile

Posts: 102
Location: Havant , UK
Joined: March 15, 2017

These Sprague caps appear to be intended for military rather than commercial applications hence the lack of data and unusual part numbers . The details previously posted on here look to be correct

Here are details my supplier just sent to me .

'CH05A1NF104K Hermetically Sealed Metallized Polyester Capacitor. MIL-C-18312 Compliant. CH05A1NF104K has unique dual dielectric.
Combination of metallized paper and polyester film, impregnated with high temperature mineral wax. Inserted tab. Insulated.'

George

RE: I have my doubts about that cap being paper and here is why., posted on April 28, 2017 at 00:03:33
Michael Samra Dealer Posts: 36118 Location: saginaw michigan Joined: January 30, 2005	George He may be right.I'll look and see if I have one of those caps because I am curious now. If I do,I'm going to break it open on the vice for verification. "For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

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Identify old Sprague caps

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