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Capacitor usage
snowm00se
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City: Royal Oak, Michigan
#1

04-03-2017, 04:51 PM
can you use a metallized polypropylene film capacitor in place of a  electrolytic capacitor?  The metallized polypropylene film capacitor does not have a + or -.  Would it make a difference how it would be hooked in to the circuit.  I am working on a 37-116. I am new at this and to the Phorum and hope my question is ok.
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Mondial
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City: Irvington, NY
#2

04-03-2017, 08:43 PM
Sure, you can use a film cap instead of an electrolytic. In fact I would recommend it for the first filter after the rectifier. The 4 or 8 uF electrolytics available today are not rated for the high ripple current of a vintage radio power supply, especially a big one like a 116 and will have a short life.

The film cap is non-polarized so you can connect it either way
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klondike98
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#3

04-04-2017, 04:40 PM
Welcome to the Phorum!
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Cheers,
Bob
[Image: https://www.dropbox.com/s/5m63ib99yfx2eg....jpg?raw=1]
Bob's Restorations Web Page
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snowm00se
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#4

04-04-2017, 06:25 PM
Thanks for the info. I had ordered the metallized polypropylene film capacitor from antique radio and was about to return them because I did not know you could use metallized polypropylene film capacitors in place of electrolytic caps that had to be installed with a plus or minus connection.
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  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration