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Having sorted through them they're all in the high 770's / 780's with a few exceptions like this double marked casing and a couple that were hovering around 820:



I considered just asking the seller what they are but I got them mixed in with a 100 lot of D9K's at an appalling 70:30 ratio so I think he might have been trying to cut the larger lots of Ge's with these non-descript Si blanks; he doesn't have anything like these listed as anything else in the shop (like I say, his D9D's have bands). I queried it immediately at the time and he sent me another 50 D9K's without question - So it's a bit of an awkward subject to approach again!

Interesting stuff anyway. For now they shall be called 'Mystery Russians'  though they are very much Si diodes, at least the ones I have.

I'm tempted to try some of the D9D's you linked to see how they compare - should be 330 / 340 - I've sent that seller a message to see what he says.
I certainly haven't come across the markings before though.

Thanks for the help.

Bingo. They absolutely do!

770mV germanium though? 

They're all around that value too so it's not like it's just a few dodgy ones. The same seller I got them from pictures their D9D's with a white band, which is consistent with what I've seen elsewhere.

These also sound brighter when used as a biasing diode in a Bazz Fuss than the other Ge diodes I have so I'd say their leakage is more consistent with Si.

Maybe someone is trying to pass these off as something they're not  It would be nice if someone else could confirm this though.

Hello madbean forum!

I just made the jump here from DIYStompboxes   

You guys seem to be an equally invaluable knowledge base and I'm hoping someone here might be able to address my query:


A few months ago I was sent a batch of silicon diodes in error by a Russian supplier of NOS Soviet military components.

I'm cataloging my stock and trying to identify what these are exactly..









They have a clear glass casing with a single white dot marking the ANODE

and a forward voltage of ~770mV in my cold-af house.


I have about 70 of them so it'd be nice to know what they are   

I haven't had the opportunity to put them into practice yet but of course if anyone would like to try some for themselves just give me a shout and I'll do my best to accommodate.

Cheers
Ben (UK)