What are some rare electronic components?
define “rare” Many vacuum tubes are no longer manufactured and are difficult to find. There are entire classes of transistors from the early days that have not been manufactured for decades and are not to be found today. For example, any point contact transistor. MAT and MADT transistors were developed by Philco for early transistorized computers. They were unreliable, and expensive, and not really that good, and were soon obsolete. There are hundreds of part numbers. See the reference. ICs, there are thousands of parts no longer made. Low density memory parts, early microprocessors, early opamps, to name a few. Then I can get into resistors, capacitors, there are thousands if not millions of part numbers that are no longer manufactured, but they mostly will have direct replacements of newer parts. .
