What's the special nature of Russian 2D503B diodes?

darwin999

darwin999

Well-known member
I see @Robert is selling Russian 2D503B Si pulse diodes, but don't know anything about their characteristics and could not locate a datasheet for them.
So does anyone have a datasheet? Can anyone tell me about their utility, and for what pedals and situations they are useful?
Thanks in advance!
 
Do you want the real story?

Robert is actually former KGB, defected to the US to become a capitalist and has been waiting for the right time to unload his bushels of Soviet components he smuggled out.

darwin999 said:
I see @Robert is selling Russian 2D503B Si pulse diodes, but don't know anything about their characteristics and could not locate a datasheet for them.
So does anyone have a datasheet? Can anyone tell me about their utility, and for what pedals and situations they are useful?
Thanks in advance!
Click to expand...
 
Humor aside, though, does anyone have actual data on them?
E.g., I'd really like to see forward I-V data.
 
Found the following on an Ebay Listing, it also compared them to a 1N4147.

Silicon pulse diodes.
All diodes are new(NOS) in sealed factory boxes,
taken from the surplus inventory.
Electrical parameters:
•Maximum DC reverse voltage: 30V;
•Maximum forward current: 20mA;
•Maximum working frequency diode: 350MHz;
•Reverse current: 10uA;
•Reverse recovery time: 0.01ms;
•Total capacity: 2.5pF
 
darwin999 said:
I see @Robert is selling Russian 2D503B Si pulse diodes, but don't know anything about their characteristics and could not locate a datasheet for them.
So does anyone have a datasheet? Can anyone tell me about their utility, and for what pedals and situations they are useful?
Thanks in advance!
Click to expand...
Seems to be a situation of they look cool and are available in large quantities for pretty cheap.
 
I had seen this data on Ebay (upper left plot), but it's at too high of a current to be relevant for most pedals.

1756733822998.png
 
Robert said:
@thomasbe86 Are those curves actual measurements or simulations? I can drag out the DCA75 if necessary.
Click to expand...
Yup yup, measurements, I used the DCA pro to get the curves, measured about 100 of each to get an accurate average (do not judge me!).
looks like the datasheet says about 1 to 1.2v at 10mA, I measured 0.8v at 10mA, I would really not mind if you pull the DCA to double check @Robert
 
From @thomasbe86's I-V measurements, they do seem to be fairly special.
I don't see many other diodes in his data that are similar to the 2D503b's with regard to their combination of Vf & curvature.
And almost all that are similar are no longer made and tough to locate.
It's the curvature that generates higher harmonics.
 
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