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

[falco_femoralis]

Soviet stuff is insane. It's a miracle what they accomplished with their socio economic situation.

 

[thomasbe86]

Here is the detail of the 100 I measured, not really readable so I took those out (for now) of the master plot:

 

[Boukman]

The Plus uses a pair of 1N4148's in one direction and pair of 2D503B's in the other direction.

View attachment 102208

Hi Robert!!Is there a schematic of the Plus pedal?? What do you think about it??

 

[Chuck D. Bones]

Those look like PIN diodes to me. Designed for vHF operation, they have a higher Vf which might be useful in pedal circuits. The various BA243, 244, 282, 283 & 482-484 have similar characteristics. Bear in mind that pedal circuits (usually) drive soft clipping diodes well below 1mA, so Vf at 10mA is of little interest.

Other than the effect of series resistance at higher currents, ALL Si PN diodes have the same shape V-I curve. It's physics. There are some Schottkys out there with unique V-I curves.