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9th January 2011, 04:27 PM
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#11 |
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diyAudio Member
Join Date: Jun 2005
Location: Los Angles, CA
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Can anyone ID this cap?
Non-polar electrolytic.
Manufactured by TSI in 12th week of 1977. Here are several similar caps in a crossover from a Triad mini-system from the mid-eighties. Note the date code: 8210 (10th week 1982) The 200uf cap is 2.1" x 0.7". Way, way, way too small to be anything but electrolytic. Last edited by kcollins; 9th January 2011 at 04:30 PM. |
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9th January 2011, 06:23 PM
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#12 |
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diyAudio Member
Join Date: Oct 2004
Location: At the sea front, just under Rotterdam
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Mea culpa, more likely neither film nor electrolytic (imo).
They're small/large enough to be paper in oil caps. These and Callin PIO caps were used in Altec '70s/'80s models ; Nineteen, Santiago, Santana II, Valencia, etc. Example picture (scuse the non bipolar part)=>
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Looks like Sponge Bob has killed another thread. Last edited by jacco vermeulen; 9th January 2011 at 06:28 PM. |
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9th January 2011, 08:13 PM
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#13 | |
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diyAudio Member
Join Date: Oct 2004
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Quote:
 If you replace these by plastic film caps you get a totally different sound. Last edited by QSerraTico_Tico; 9th January 2011 at 08:15 PM. |
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10th January 2011, 03:53 AM
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#14 |
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diyAudio Member
Join Date: Jun 2005
Location: Los Angles, CA
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I think Jacco gets the prize on this one.
 Having never (until about ten minutes ago) cut one open, I would not have believed a PIO cap could have the volumetric efficiency to pack 200uf in so small a package. However, given the low voltage rating, it appears that it is indeed possible. Interestingly, the 2mil (0.06mm!) foil electrodes appear to be something other than aluminum. Tin perhaps? One thing is certain: they do not melt or oxidize when heated to almost white heat with a torch. Definitely not aluminum. In any event, I think most of us would agree that these capacitors would best be replaced with ones using a more modern dielectric. |
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10th January 2011, 04:45 AM
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#15 | |
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diyAudio Member
Join Date: Aug 2002
Location: Sofia
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Quote:
I am also surprised by the contents of the cap. Many thanks to you and Jacco. |
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10th January 2011, 07:51 AM
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#16 |
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diyAudio Member
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Huh,interesting. Thanks for the investigation guys! I guess I'll order up some new caps and call it good.
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