What kind of capacitor is this?

kmj · 29th January 2006, 02:27 PM

Hi, could someone tell me somthing about these sprague capacitors?

sprague 1uF 600V 118p10506s4

What I'm looking for is usage, quality, are they easy to get ahold of, estimated price and so on.
And what is Hermetpoly?

I'm asking because a friend of mine gave some of these to me, i'm not looking to sell them but it would be fun to know a value and usage for them.

best regards

kmj · 30th January 2006, 03:33 AM

I know that they where used in a Swedish fighterjet, in the guidingsystem I think.

Damon Hill · 31st January 2006, 03:43 PM

They're 1 microfarad at 600 volts DC, probably plastic
film. "Poly" could mean anything; mylar, polypropylene,
polystyrene, in increasing order of quality. There are other
types of plastic film in roughly the same range of quality.

Since they're apparently military specification, they should
be very good build quality, depending on the type of
dielectric used. If you have a voltmeter and a power supply,
charge one up (no more than 50 volts DC for safety reasons)
and then short the leads together after the capacitor has
been charged for a few minutes. After discharging the capacitor,
separate the leads and measure the remaining voltage. The
lower the voltage the better the quality of the dielectric.

Polypropylene should read below .1 volt after discharge, and
stay fairly low. Mylar will read higher and may rise to several
volts, which is less desirable (the plastic film has a 'memory').

If the body or leads are magnetic, this is less desirable, but
hardly fatal.

Most likely application might be in speaker crossovers, coupling/
bypass capacitors in tube power supplies. Don't use them in
AC power line circuits unless they are specificially designed for
that application! They probably won't fail, but it's >how< they
fail that's important.

kmj · 31st January 2006, 04:19 PM

thanks

I´ll check at work if the electricians have something to check them with.

sreten · 31st January 2006, 04:29 PM

Hi,

hermet = hermetically sealed, poly = polyester.

/sreten.

kmj · 31st January 2006, 05:04 PM

Quote:

hermet = hermetically sealed,

yeah, but isn't all modern caps sealed that way?

29th January 2006, 02:27 PM	#1
kmj diyAudio Member Join Date: Feb 2004 Location: Falkenberg	What kind of capacitor is this? Hi, could someone tell me somthing about these sprague capacitors? sprague 1uF 600V 118p10506s4 What I'm looking for is usage, quality, are they easy to get ahold of, estimated price and so on. And what is Hermetpoly? I'm asking because a friend of mine gave some of these to me, i'm not looking to sell them but it would be fun to know a value and usage for them. best regards

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30th January 2006, 03:33 AM	#2
kmj diyAudio Member Join Date: Feb 2004 Location: Falkenberg	I know that they where used in a Swedish fighterjet, in the guidingsystem I think.

31st January 2006, 03:43 PM	#3
Damon Hill diyAudio Member Join Date: Mar 2001 Location: Auburn, WA (somewhere between Seattle and Tacoma) Blog Entries: 1	They're 1 microfarad at 600 volts DC, probably plastic film. "Poly" could mean anything; mylar, polypropylene, polystyrene, in increasing order of quality. There are other types of plastic film in roughly the same range of quality. Since they're apparently military specification, they should be very good build quality, depending on the type of dielectric used. If you have a voltmeter and a power supply, charge one up (no more than 50 volts DC for safety reasons) and then short the leads together after the capacitor has been charged for a few minutes. After discharging the capacitor, separate the leads and measure the remaining voltage. The lower the voltage the better the quality of the dielectric. Polypropylene should read below .1 volt after discharge, and stay fairly low. Mylar will read higher and may rise to several volts, which is less desirable (the plastic film has a 'memory'). If the body or leads are magnetic, this is less desirable, but hardly fatal. Most likely application might be in speaker crossovers, coupling/ bypass capacitors in tube power supplies. Don't use them in AC power line circuits unless they are specificially designed for that application! They probably won't fail, but it's >how< they fail that's important.

31st January 2006, 04:19 PM	#4
kmj diyAudio Member Join Date: Feb 2004 Location: Falkenberg	thanks I´ll check at work if the electricians have something to check them with.

31st January 2006, 04:29 PM	#5
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, hermet = hermetically sealed, poly = polyester. /sreten.

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