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 Post subject: Identify polarity of T.I. cap
PostPosted: Feb Wed 13, 2019 2:14 am 
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Location: Northwest Indiana
Back before the interweb, when I was in HS, I had a CB station. CB is long since gone but I dug up the power supply I had for it. It's a Valor VRPS-6, no info to be found for it that I could find. Anyway, want to get it up and running, one 100uF cap needs replaced. It looks like a (+) mark on the arrow stripe but is odd looking. What say Ye?

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 Post subject: Re: Identify polarity of T.I. cap
PostPosted: Feb Wed 13, 2019 2:55 am 
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Location: RI, 02885
I would ignore the old cap and install the replacement with the negative in the hole corresponding to the B- (common) and the positive through the hole to the B+. Look at foil side of your PCB to determine B- & B+. I would also ignore the + written on the top of the PCB unless you know it was applied to the correct point on the board. I rarely trust previous work done by others and always check polarity of filters to ease my mind (what's left of it).

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 Post subject: Re: Identify polarity of T.I. cap
PostPosted: Feb Wed 13, 2019 12:58 pm 
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Location: Fernandina Beach, FL
I have seen capacitors of that era having he positive (+) lead marked, unlike the “standard “ today of marking the negative (-) lead which is usually the shorter lead. Have we determined that this capacitor was installed incorrectly? Isn’t this the original capacitor?

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 Post subject: Re: Identify polarity of T.I. cap
PostPosted: Feb Wed 13, 2019 5:20 pm 
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Location: Northwest Indiana
I had thought TI was Texas Instruments but I guess its Tecante Industries? Found a pic of one on the ebay. The arrow side indeed is a (+) marking though skewed apparently.

https://www.ebay.com/itm/10-6-3V-1000uf-MFD-TI-Capacitor-105C-T-I/361012306994?hash=item540e02a432:g:NA4AAOSwd4tT3pF3:rk:4:pf:1&frcectupt=true


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