 They were initially used to replace Gibson's original "bar" or "blade" pickup, also known as the Charlie Christian pickup, on models such as the ES-150, and by the end of the 1940s it was the standard pickup on all models.The P-90's reign as the Gibson standard pickup was short-lived, as a new design of pickup, the humbucker, was introduced in 1957.Equipped with double coils, the new pickup boasted greater output and less hum, although with less high end response.