There was once a monthly British magazine called Punch. It was first published in July 17 of 1841. It survived for decades eventually becoming a national institution. It went through changes in management, ownership, format, layout and the occasional scandal. After 160 years and almost 2000 issues, it ceased to exist in 2002 after a failed reboot in the early 1990s. This has nothing to do directly with radio. But recently I came into the possession of two issues. One is from November of 1927, and the other from December 1931—the golden age of radio. I scanned a couple ads for your edification: Ecko, Philips, Lotus, Langham and Mullard valves.
All content herein should be considered to have a Creative-commons-like license with the sole exclusion of Wikipedia. I welcome use of my research by all writers, readers and researchers except those that would publish such information on Wikipedia. Thank you.