what type of cap is this?

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It was used as a high pass in a Rodgers Tone Cabinet. It is a Sprague BTW.

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Non-polar electrolytics, especially the older ones, tend to be huge. I would not be surprised if the part is a custom made electrolytic with resin seal. The tell is the fact that the maker chose to mark is as non-polar, something not usually done with film caps. Even a cheap polyester cap of the same rating would be an improvement, and a polypropylene unit miles better, and about the same size. A troll through E-pray with the search criterion " 6uF 100V -electrolytic" might prove rewarding.
 
I have seen tons of those, non polarized electrolytics, black plastic body with resin ends, in old VOX amplifiers, the solid state ones made in USA in late 60´s early 70´s by Thomas Organ.

They were large for the value because of 2 reasons:
a) old technology
b) if non polarized , they are basically 2 back to back standard elecrolytics in the same case ... that takes twice as much space.

Here´s 4 "black plastic resin ends" electrolytics:
 

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Check the surplus places like BG Micro, All Electronics, or Electronic Goldmine, and you can likely find a far superior replacement film cap for pennies on the dollar. Of course, if you want to pay real money, you can always try Digi-Key or the Mouse...

Keep in mind also that the tolerance on that NP cap was likely no better than +/- 20%. A film cap will be 10% tolerance or better.
 
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