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old russian capacitors

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  1. #1
    Mario85Poland started this thread.
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    Question old russian capacitors






    i am from poland
    the green one and two red ones are famous for palladium and platinum
    but the others?

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  3. #2
    Mario85Poland started this thread.
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    they looks like that


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  5. #3
    Mario85Poland started this thread.
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    next ones:
    vintage russian diodes
    the strange capacitor
    and capacitor K 52 made with platinum

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  7. #4
    Mario85Poland started this thread.
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    and sorry for my camera!
    i know bad quality
    tomorrow i will make some photos

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  9. #5
    Mario85Poland started this thread.
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    ok
    what kind of metal is this?
    it.s non magnetis, very breakable. from old russian capacitors.






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    Can't make out the part number on the outside. But you may or may not be able to use that to find whether an individual capacitor is tantalum, niobium or aluminum

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  13. #7
    Mario85Poland started this thread.
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    i have russian capacitors which are made with palladium ( green old KM capacitor) many red ones ( which have 10% silver) but i don't know what is in these brown ones.

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    Mario85Poland started this thread.
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    This one are made with palladium:




    These ones are made with paladdium, as well:


  15. #9
    Mario85Poland started this thread.
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    Old russian capacitors KM H90 contains 46,5 g palladium and 2,5 g platinum per 1 kilogram.
    Old russian capacitors KM H30 contains 50 g platinum per 1 kilogram.

    This is a photo of these capacitors:


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    Oh nooooooo. How much of these have i chucked out?

    I know the 'paint drop tantis are worth $

    But the flat green ones?????

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    Mario85Poland started this thread.
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    the flat gren ones have contains 46,5 g palladium and 2,5 g platinum per 1 kilogram.

    in the Usa you use ounces and pounds, dont you?
    so its like 0,8 ounce of palladium per a pound

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    I have been saving up the 'Paint drop' Tantalum capactors, and the yellow 'Brick shaped' Tantis, but in the photos above theres the same colour yellow 'Pillow shaped' capactors that i have not saved any of.




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  20. #13
    Mario85Poland started this thread.
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    The "metal" from these old russian brown capacitors turns to white when it's on air ( it coats with a white coating ) what could it be? silver-mica?


  21. #14
    blackgold12 is offline Metal Recycling Entrepreneur
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    Quote Originally Posted by Mario85Poland View Post
    The "metal" from these old russian brown capacitors turns to white when it's on air ( it coats with a white coating ) what could it be? silver-mica?


    Silver is slow to oxidize in air but when it does the oxide is black.

    How quickly is the white oxide forming when exposed to air.


  22. #15
    blackgold12 is offline Metal Recycling Entrepreneur
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    You may have one of the rare earth elements that readily oxidize when exposed to air.

    Niobium (atomic number: 41) is a shiny, white, soft, and ductile metal, and takes on a bluish tinge when exposed to air at room temperatures for a long time. The metal starts to oxidize in air at high temperatures, and when handled hot must be done so under a protective atmosphere so as to minimize oxide production.

    Lanthanum (atomic number: 57)
    is silvery white, malleable, ductile, and soft enough to be cut with a knife. It is one of the most reactive of the rare-earth metals. It oxidises rapidly when exposed to air. Cold water attacks lanthanum slowly, and hot water attacks it much more rapidly. The metal reacts directly with elemental carbon, nitrogen, boron, selenium, silicon, phosphorus, sulphur, and with halogens. It is a component of, misch metal (used for making lighter flints).


    Cerium (atomic number: 58)
    is an iron-grey lustrous metal. It is malleable, and oxidises very readily at room temperature, especially in moist air. Except for europium, cerium is the most reactive of the rare-earth metals. It slowly decomposes in cold water, and rapidly in hot water. Alkali solutions and dilute and concentrated acids attack the metal rapidly. The pure metal may ignite when scratched with a knife. It is the most abundant of the rare earth metals and is found in minerals including allanite, monazite, cerite, and bastnaesite.


    Praseodymium (atomic number: 59)
    is soft, silvery, malleable, and ductile. It was prepared in relatively pure form in 1931. It is somewhat more resistant to corrosion in air than europium, lanthanum, cerium, or neodymium, but it does develop a green oxide coating that "spalls" away when exposed to air. The metal should be stored under an inert atmosphere or under mineral oil or petroleum. The rare-earth oxides, including Pr2O3, are among the most refractory substances known. It is a component of misch metal, used for lighter flints, and of the glass in welders' goggles.


    Neodymium (atomic number: 60)
    is present in misch metal to the extent of about 18%. The metal has a bright silvery metallic lustre. Neodymium is one of the more reactive rare-earth metals and quickly tarnishes in air, forming an oxide that spalls off and exposes the metal to further oxid


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