Germanium transistors, a dive into the 1960-1980 European types with their properties

Video about Germanium transistors, types and type numbers, made in Europe during the 1960’s and the early and late 1970’s. How to test them and use them & what you can expect when testing them on their current Amplification factor (Hfe) or when studying the properties via the datasheets. Video about how to test Germanium transistors is here    • How to test Germanium transistors? Ambigui...   At the moment (2020) there is a gained interest in using Germanium transistors in (say) guitar amplifiers or other audio amplifiers. Often is told: they have a better sound. This video gives some insight in searching and how to make an assessment when buying/finding a Germanium transistor. My You Tube channel trailer is here:    • Radiofun232 on YouTube, find working & tes...   There are (some) links to my video’s on YT available on my Channel Trailer in the “comments” section. Select, in the comments section, always “NEWEST FIRST” to get the right overview. My books about electronics & analog radio technology are available via the website from “LULU”, search for author “Ko Tilman” there. https://www.lulu.com/search?adult_aud... Some of my books (not all) are available via Barnes and Noble and via Amazon. But all my books (the complete bunch) are/is available on the website of LULU. Regarding all my video’s: I constantly keep them actual, so the original video’s with the most recent information are always on YouTube. That is the source, and search there. When my video’s are reproduced or re-edited on other websites/channels you can not (!) be sure about the original content (=really working electronics with real properties for a purpose) and important adaptations to the circuits. Be aware of that, I saw on the internet my circuits reproduced in a poor or not proper way. I also found that people probably republish my circuits under phantasy names and/or with phantasy properties, attributing electronic properties to them that they were never made for, so phantasy properties. Sometimes they want to find gold with them. I take distance from all these fake claims; I cannot help that it happens, sorry. Upload 23 July 2020.