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Old 11th October 2013, 01:12 PM   #1
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Default better polystyrene of the two

hi, which one do you think would perform better?

33pF Polystyrene Capacitors 5 50VDC 50 Items per Sale Lot | eBay

vs

5 Mallory 22pF 600V Polystyrene Axial Capacitors 5 | eBay

higher rating on mallory but the other one seem to be copper tinted.
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Old 11th October 2013, 01:41 PM   #2
DF96 is offline DF96  England
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Both ebay links provided no information for me. I understand this is a known problem, although one which from time to time is claimed to be solved.

However, you need to tell us what circuit function you wish them to perform and what you mean by better.
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Old 11th October 2013, 02:27 PM   #3
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You can expect them to be different, very different. 1) they are different values and 2) they are different voltages.

The higher voltage caps will have more dielectric between the plates for insulation.
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Old 11th October 2013, 03:11 PM   #4
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i was hoping someone could take a look at them to guess as to if either one of them is film element.
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Old 11th October 2013, 03:12 PM   #5
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Click the image to open in full size.

Click the image to open in full size.

here we go. the first pic is for 220pf but i'm after 33pf and the circuit, miniref, where i'll be using them can accommodate both 33 and 22 tho with better distortion/worse stability trade off.

Last edited by PreSapian; 11th October 2013 at 03:15 PM.
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Old 11th October 2013, 08:29 PM   #6
Elvee is offline Elvee  Belgium
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It is difficult to tell outright from the pic, or even the spec sheet: in general PS caps are OK, but I have measured a number of counter-examples, even from manufacturers you wouldn't think are questionable.
Anyway, unless you intend to use them for power applications, it doesn't really matter.....
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Old 12th October 2013, 07:48 AM   #7
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were the poor measuring ones worse than a film pp cap?
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Old 12th October 2013, 01:25 PM   #8
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by PreSapian View Post
were the poor measuring ones worse than a film pp cap?
Much worse
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Old 13th October 2013, 02:43 PM   #9
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I can't tell from the pics, but I'd probably go with the radial lead ones, rather than the axials. The radial lead, copper foil ones (Noble?) have been OK. Evox/Rifa PFE225 and a Philips KS, both square cross-section box types, are also very good, as are ERO KP1834 and KP1835.

Last edited by linuxguru; 13th October 2013 at 02:44 PM. Reason: addendum
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