Editing AC adapter (section)

=== Battery eliminator ===
[[File:Roger's Batteryless Ad.jpg|thumb|November 1925 magazine ad for battery eliminator]]
A battery eliminator is an adapter intended to allow a device intended for battery operation, such as a radio, to be operated from an AC outlet.<ref>{{Cite web |title=What Google is buying: Motorola's 83-year history of invention |url=https://money.cnn.com/galleries/2011/technology/1108/gallery.motorola_history/index.html |access-date=2023-06-25 |website=CNNMoney}}</ref>

All radios, except [[crystal set]]s, used inconvenient and messy [[vacuum tube batteries]] until the mid- to late-1920s. Battery eliminators that plugged into [[light socket]]s became very popular.<ref name="ramirez1993">{{Cite book |last=Ramirez |first=Ron |url=https://www.worldradiohistory.com/BOOKSHELF-ARH/History/Philco-Radio-1928-1942-Ramirez-1993.pdf |title=Philco Radio 1928-1942 |publisher=Schiffer Publishing |year=1993 |isbn=0-88740-547-9 |location=Atglen, Pennsylvania |pages=6–7, 10 |access-date=2024-12-13}}</ref> Early commercial units were produced by the [[Edward S. Rogers, Sr.]] company in 1925 as a complement to its line of [[batteryless radio]]s.<ref>{{Cite web |title=Rogers Recollections: A Chronicle of Excellence and Achievement |url=https://ewh.ieee.org/reg/7/millennium/alternating_current/ac_recollections.html |access-date=2023-06-25 |website=[[IEEE]]}}</ref> Another early producer of battery eliminators was the Galvin Manufacturing Corporation (later known as [[Motorola]]), which was opened on September 25, 1928 by [[Paul Galvin (businessman)|Paul Galvin]] and his brother Joseph E. Galvin.<ref>{{Cite web |title=Work begins at company that designs first mass-produced car radios |url=https://www.history.com/this-day-in-history/first-day-of-work-at-the-galvin-manufacturing-corporation |access-date=2023-06-25 |website=HISTORY |language=en}}</ref> Eliminators became obsolete for radios after [[RCA]] introduced [[Vacuum tube#AC power|AC tube]]s in 1927, enabling receivers to plug into [[household power]]. The industry rapidly adopted AC tubes, and companies which launched exclusively manufacture that product such as [[Philco]] had to quickly pivot to radio manufacturing to remain relevant and existent. {{r|ramirez1993}}