Hello
Since I started to enjoy electronics, I have always use the D226 Soviet diode.
It has been available in Cuba for years as almost all the vintage Soviet equipment used it. I have always thought that it was a Silicon diode, but now I read on radiomuseum.org that it is a Germanium diode
http://www.radiomuseum.org/tubes/tube_d226.html
So I made some test, cause I have always seen a voltage drop of 0.6 to 0.8 volts on this kind of diodes.
I measure the voltage drop as I passed a current throught it. With 5mA it dropped 0,55V and with 40mA, it dropped 0,8V. It behaves as a Silicon diode but with some differences.
I did the same test wit a KD202 diode (which I know is a Silicon diode, due to the prefix K [
кремний]) and it dropped between 0,58 and 0,65V with the same variation of current.
AFAIK, Germanium P-N junctions drop 0,2 to 0,3V when forward biased.
So, I think there are several possibilities here:
1.) It is a Silicon diode.
2.) It is a special kind of Germanium diode
3.) It is three Germanium diodes in series.
Any help about this?
Thanks in advance