Ussr millitary spec tantalum capacitors

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Thirmo21

Thirmo21

Member
Joined
Oct 8, 2023
Messages
24
Location
EU, central
Hello everyone. I found these in my grandads stash. He told me back when he was in army they were in millitary storage and as far as he remembers these are out of spec and arent working as they should. And he let me have them.
I looked up on Russian electronics website that they are tantalum caps.

I have around 0.5kg of these tantalum caps
25 K52-2 (one K52 clipped weighs 20g)
And some ETO-2 and ETO-1 caps

I am wondering what is the price per kg. Anyone knows what could i expect?
 

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Hello, congratulations on finding the treasure.
Usually, the year of their production is important (before 1983 or after), but since there is a diamond there - a mark of military acceptance, it doesn’t matter.
I buy ready-made ones right now
ETO-2 = 2.2 Euro
ETO-1 =0,41
K52-2 =1,9
Precious metal content
k52-2
silver 1800 grams per 1000 pcs
tantalum 7693 grams per 1000 pieces
ETO-2
silver 2000 grams per 1000 pcs
tantalum 9100 grams per 1000 pieces
 
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In general, these are very good, high-quality and almost eternal capacitors.
are still in demand....

just don't sell them to the Russians
they will go to war
 
small amount of tantalum will be bought from us at a price of about $130 per kilogram
 
anarxi said:
Hello, congratulations on finding the treasure.
Usually, the year of their production is important (before 1983 or after), but since there is a diamond there - a mark of military acceptance, it doesn’t matter.
I buy ready-made ones right now
ETO-2 = 2.2 Euro
ETO-1 =0,41
K52-2 =1,9
Precious metal content
k52-2
silver 1800 grams per 1000 pcs
tantalum 7693 grams per 1000 pieces
ETO-2
silver 2000 grams per 1000 pcs
tantalum 9100 grams per 1000 pieces
Click to expand...
Thanks for info, I was mainly interested in yield. I am holding onto them.
If i will decide to sell, you will hear from me first. And yeah i agree dont sell to Russia.
 
Thirmo21 said:
Hello everyone. I found these in my grandads stash. He told me back when he was in army they were in millitary storage and as far as he remembers these are out of spec and arent working as they should. And he let me have them.
I looked up on Russian electronics website that they are tantalum caps.

I have around 0.5kg of these tantalum caps
25 K52-2 (one K52 clipped weighs 20g)
And some ETO-2 and ETO-1 caps

I am wondering what is the price per kg. Anyone knows what could i expect?
Click to expand...


Nice! I’m not sure, but I’m guessing they’re pretty similar to these? They should have a good amount of silver also.


 
In my experience, numbers are same as state above. Around 9-10% Ag by weight of legless caps without any junk on them.
Only thing is how to open them in an easy way... It isn´t trivial task, as they are filled with aqueous sulfuric acid. Some folks just let them explode in the heated steel barrel. however, this does not even sound safe. I have seen perforated steel drum after this operations :D explosions like shots from powerful shotgun. Not recommended.

I thought about running them through some shredder, recover the silver and tantalum, separate iron casings with magnetic separator... But I never had such device, so I resorted to angle grinder approach and cut the whole face of the cap - this way it is relatively easy to pull out the guts.

By the way, many of these K52 have palladium plating on the inner side of silver cap. Decimals of % speaking of weight, but Pd is there. If you will have bigger amount in the future, it is worth stripping from solution.
 
adam mizer said:
Maybe you guys can help.
I have had these for a while and don't know if they have anything precious in them to go for.
Click to expand...
there's this thing in the center, violet-lilac.
It doesn't look like a capacitor.
This is the color of ceramics commonly used in Soviet technology for diodes and thyristors.
Can I please have a more detailed photo of this thing...
 
No markings on it unless its hidden on other side. It does not give resistance reading or diode reading however it has capacitance reading on meter.
0.38nF maybe not because meter stays there when disconnected.
Was used on circuit going to the nitrogen laser tube.
 

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Nitrogen laser tube.
I'm interested also of the metal material inside the tube it has what appears to be a long mirror shine metal attached on another maybe base metal and is on both sides.
 

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adam mizer said:
Nitrogen laser tube.
I'm interested also of the metal material inside the tube it has what appears to be a long mirror shine metal attached on another maybe base metal and is on both sides.
Click to expand...
Be careful around specialized equipment, and mainly military/laboratory equipment. Unlike consumer electronics, these devices can contain whole array of very nasty (and sometimes even radioactive) materials. Of course, content of PM´s is oftentimes much higher than in average scrap. But the likelihood of encountering things like berylium oxide, beryllium "slits/windows", cadmium salts, mercury etc. is also higher.
 

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