Ussr millitary spec tantalum capacitors

[Thirmo21]

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?

 

[anarxi]

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

 

[anarxi]

be careful they contain sulfuric acid

 

[anarxi]

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

 

[anarxi]

small amount of tantalum will be bought from us at a price of about $130 per kilogram

 

[Thirmo21]

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

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.

 

[macfixer01]

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?

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

 

[orvi]

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 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.

 

[anarxi]

tantalum capacitor К52-9 and K52-11
The body itself is made of tantalum.
from a rocket

 

[adam mizer]

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.

 

[orvi]

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.

These are high voltage ceram caps - so only silver there, around 0,6-0,8g/piece. However, I could not find this exact type, so the numbers are not guaranteed.

 

[anarxi]

These are high voltage ceram caps - so only silver there, around 0,6-0,8g/piece. However, I could not find this exact type, so the numbers are not guaranteed.

The reference book, reliable, writes:

641.05 grams per 1000 pieces.

 

[adam mizer]

Nice, thank you for this information.
Worth processing with more material.