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| Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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4th Oct 2015, 7:56 pm
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#1 |
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Triode
Join Date: Aug 2006
Location: Bury St Edmunds, Suffolk, UK.
Posts: 44
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Perdio Portarama MK2
Gents and Ladies a question re my Perdio Portarama MK2. Single standard (405) grey case. There are a number of Capacitors shown on the Trader sheet as having + polarity on both terminals, I have not come across this before. Electrolytics yea no problem, non polarised no problem but two + terminals per cap?. On trader sheet 1652 they are C129 and 130 in the frame Timebase.
I feel a little stupid asking this but Ive never come across them before. Thanks in anticipation. |
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4th Oct 2015, 8:19 pm
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#2 |
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Dekatron
Join Date: Jun 2015
Location: Biggin Hill, London, UK.
Posts: 5,208
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Re: Perdio Portarama MK2
I don't have that trader sheet, but if you mean the capacitor symbol has 2 'hollow' plates, like the +ve plate of a normal electrolytic then that is a conventional symbol for a non-polarised (reversable) electrolytic capacitor.
This is a way to get large value (10's of uF) non-polarised capacitors (although they do have some 'quirks'). |
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4th Oct 2015, 8:25 pm
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#3 |
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Moderator
Join Date: Dec 2010
Location: Exeter, Devon and Poole, Dorset UK.
Posts: 6,865
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Re: Perdio Portarama MK2
They are probably non polorised electrolytic's you often see them in loud speaker cross over filters.
An example can be seen here. http://www.ebay.com/itm/68uf-68mfd-1...-/281769903165 Already posted by Tony Cheers Mike T
__________________
Invisible airwaves crackle with life or at least they used to  Mike T BVWS member. www.cossor.co.uk Last edited by Cobaltblue; 4th Oct 2015 at 8:26 pm. Reason: added Tonys post |
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4th Oct 2015, 8:37 pm
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#4 |
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Triode
Join Date: Aug 2006
Location: Bury St Edmunds, Suffolk, UK.
Posts: 44
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Re: Perdio Portarama MK2
Thanks gents, appreciated. Cheers
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4th Oct 2015, 11:09 pm
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#5 |
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Rest in Peace
Join Date: May 2003
Location: Harlaxton, Lincolnshire, UK.
Posts: 3,944
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Re: Perdio Portarama MK2
Yes, as has been said, reversible electrolytic capacitors.
A snippet from Trader sheet 1652 is shown below. |
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5th Oct 2015, 10:55 am
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#6 |
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Dekatron
Join Date: May 2003
Location: Edinburgh, UK.
Posts: 3,274
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Re: Perdio Portarama MK2
Some types of electrolytic capacitor can not tolerate reverse bias others can and the non-polar ones are simply two of the latter back to back.
Peter |
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