File:Mullard OC170.jpg

Summary
https://commons.wikimedia.org/wiki/File:Mullard_OC170.jpg Description OC170 germanium PNP alloy junction transistor in TO1 metal case. These were a common transistor in the 1960s for RF and IF stages. This package is noted for a fourth 'shield' connection to the case. These transistors are now decades old and most have failed from the formation of internal metal crystalisation known as 'whiskers' that cause short circuits. Date	9 June 2015 Source	Own work Author	Andy Dingley