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Antique Radio Technical Forum
paper vs electrolytic filters

Posted by Peter G. Balazsy on 04/15/2009 01:47

Metal cans are quite often polarized. And most are electrolytic.
Typically the outside body is negative and the terminal in the phenolic area is positive.

But basically it does not matter whether you decide to use a polarized electrolytic or a non-polar capacitor.
What matters is that you replace the old capacitor with a new one of similar value capacitance and voltage rating.

So for instance if your equipment used 4 uf @ 300vdc electrolytic caps... you do not need to replace them specifically with electrolytic caps... you can just replace it with ANY 4 uf @ 300-400vdc

If you ever find a non-polar, non-electrolytic cap in a DC circuit area (such as a power supply filter)....you could replace it with a polarized electrolytic cap.. you just need to place the positive terminal in the most positive part of the circuit.... such as the cathode of the rectifier.

So any cap can usually replace any other cap as long as the size and voltage are appropriate... and when using electrolytics.. just observe proper polarity.

paper vs electrolytic filters 
SCOTTY 04/14/2009 19:56 
av1 04/14/2009 20:22 
SCOTTY 04/14/2009 22:53 
Peter G. Balazsy 04/15/2009 01:47 
SCOTTY 04/15/2009 14:35 
Edd 04/15/2009 22:25 
SCOTTY 04/16/2009 13:45 

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