I suggest your local electronics parts jobber, or one of the mail order or internet electronics parts stores (e.g. Mouser, DigiKey, Jameco Electronics).
Roughly, 200m mV.
There is no exact substitute for a germanium diode, except another germanium diode. However if the only concern is to get a lower forward voltage drop than that of a silicon diode (0.7V), then a schottky barrier diode may be a suitable replacement as its forward voltage drop (<0.1V) is even lower than that of a germanium diode (0.2V).
The entire 1N40xx series of power diodes are all silicon. The OA79 small signal diode is germanium.
0a79 ( germanium diode )in glass construction form is used in AM detector circuits.
Germanium
The 1N34 is a germanium signal diode, so it would be used as a detector/mixer in a.m. reception for example.
Roughly, 200m mV.
There is no exact substitute for a germanium diode, except another germanium diode. However if the only concern is to get a lower forward voltage drop than that of a silicon diode (0.7V), then a schottky barrier diode may be a suitable replacement as its forward voltage drop (<0.1V) is even lower than that of a germanium diode (0.2V).
In general O in diodes stands for germanium.since OA79 is a germanium diode O stands for germanium
A germanium diode has a lower forward voltage drop compared to a silicon diode, typically around 0.3V for germanium and 0.7V for silicon. Germanium diodes also have a higher reverse current leakage compared to silicon diodes.
In OA79, the letter A stands for rectifier diode and O stands for Germanium. It acts as a point contact germanium diode and also be replaced with 1N4148 depending on the circuit.
The entire 1N40xx series of power diodes are all silicon. The OA79 small signal diode is germanium.
The main difference between a silicon diode and a germanium diode is the forward voltage drop. Silicon diodes have a higher forward voltage drop (around 0.7V) compared to germanium diodes (around 0.3V). Additionally, silicon diodes have better temperature stability and higher reverse breakdown voltage compared to germanium diodes.
A Germanium diode has a much lower breakdown voltage than a silicone diode.
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0a79 ( germanium diode )in glass construction form is used in AM detector circuits.
IN IN = 1N: Refers to the number of junctions (1N= 1 junction). O= Germanium, A= rectifier diode, so OA = germanium rectifier diode.