According to radiomuseum this AF260 marked Ei NIS is a PNP germanium alloy transistor alloy transistor intended as AM IF amplifier. Their reference source is the German data book "Transistoren Vergleichstabelle" 1979/80.
Again according to radiomuseum this AF275 with the Ei logo on it is a PNP germanium alloy high-frequency transistor.
I also have this AD463 powere type with the Ei logo on it. According to radiomuseum it is a PNP germanium alloy transistor intended as an AF power amplifier or switch. A bit of investigation on radiomuseum and www.web-bcs.com reveals several series of germanium power transistors made by Ei:
- AD412 and AD415 in TO-3 cans
- AD430 to AD434, AD436 to AD439 in TO-3 cans
- AD450 to AD459 in TO-3 cans
- AD460 to AD469 in TO-3 cans
- AD541, AD542 and AD545 in TO-36 cans
- AD701D, AD701J, AD702A, AD702Z in TO-3 cans
The data for these come from the "Jaeger electronic catalog" 1999.
I am interested in obtaining any other germanium transistors or diodes by Ei. If you know about their earliest semiconductors, or have some for sale or trade, please
Here is a small glass-body diode, type AAZ23, made by Ei NIS. The part number indicates that it is germanium, but I cannot find any data for this device, so if you can provide any please
I have no devices at all made by RIZ. Some are offered on eBay, but all are silicon types.
I am interested in obtaining any germanium transistors or diodes by RIZ. If you know about their earliest semiconductors, or have some for sale or trade, please
An eBay search for Iskra brings up electronic components of all types, including silicon transistors and diodes. However I'm unsure if these are relatively modern, as there now exist multiple companies descended from the original Iskra.
If you know about older Iskra semiconductors (e.g., germanium ones), or have some for sale or trade, please
I have no knowledge at all about either IRET or Radio Industrija Nikola Tesla.
If you know whether or not these companies made semiconductors, or have some for sale or trade, please