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Old 2nd June 2009, 01:31 PM   #1
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Default Apogee Scintilla capacitors

I've bought a 20 year old ribbon speaker (Apogee Scintilla) and noticed that the midrange is quite dark.

Should the Sprague polypropylene caps (25 of them!) be replaced given their age?

Do polyprops perform more poorly as they age?
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Old 3rd June 2009, 10:23 AM   #2
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As far as I know, polyprops don't suffer ageing.

Age is solely a problem with electrolytic capacitors.
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Old 3rd June 2009, 12:19 PM   #3
Cobra2 is offline Cobra2  Norway
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Been here?
http://www.apogeespeakers.com


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Old 4th June 2009, 12:28 PM   #4
a.wayne is offline a.wayne  United States
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I have experienced some "darkness ' with old poly caps , if left sitting for a long time ..
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Old 4th June 2009, 03:05 PM   #5
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Dark probably means low output from the tweeter ribbon?

These speakers were never known to be dark. Of course a bit depends on your amplification, as the load is rather low Z... so the amp might be "croaking" on the load??

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Old 4th June 2009, 03:21 PM   #6
SY is offline SY  United States
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Do poypropylene capacitors deteriorate over 20 years?
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And while they may not be as strong as apes, don't lock eyes with 'em, don't do it. Puts 'em on edge. They might go into berzerker mode; come at you like a whirling dervish, all fists and elbows.
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Old 5th June 2009, 05:18 AM   #7
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Ummm... SY? These are magnetic ribbon speakers?? No bias, no diaphragm connection like ESLs have...

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Old 5th June 2009, 08:52 AM   #8
Cobra2 is offline Cobra2  Norway
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The crossover:

http://www.apogeespeakers.com/projec..._schematic.gif

http://www.apogeespeakers.com/projec..._schematic.gif

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Old 5th June 2009, 10:15 AM   #9
SY is offline SY  United States
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Quote:
Originally posted by bear
Ummm... SY? These are magnetic ribbon speakers?? No bias, no diaphragm connection like ESLs have...

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My bad.
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And while they may not be as strong as apes, don't lock eyes with 'em, don't do it. Puts 'em on edge. They might go into berzerker mode; come at you like a whirling dervish, all fists and elbows.
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Old 7th June 2009, 05:35 PM   #10
champ04 is offline champ04  United States
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Never had a problem with my ancient Apogees. FWIW.
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