JBond has all the cool stuff and a lot of knowledge, do you know him? I saw these links to sites of transister collectors. I miss the early days of the internet when there were many more historical site like these. http://www.wylie.org.uk/technology/technology.htm http://semiconductormuseum.com/Museum_Index.htm
Someone posted a link to one page on this and I ended up reading the whole history https://www.sony.net/SonyInfo/CorporateInfo/History/SonyHistory/1-06.html Sometimes the best information is from the manufacturers original brochures. Check out https://www.hifi-archiv.info/