d in British and Canadian Marconi apparatus and popular among Canadian amateurs. It operates with a filament voltage of 6, filament amperage of .75, and plate voltage of 22.5. "MT5 " Valve Mount " MT5 " Valve Catalogue No. 231. Catalogue No. 220 The neat mount in this illustration is The " MT5"… … Valve Mount Adapter Valve Mount Catalogue No. 232 Catalogue No. 230
Radio
Internet Archive · Fisher - University of Toronto · Public domain (published before 1931). Free to use for anything.
![An illustration from The Telegrapher [microform] (1864)](https://img.insideoutlibrary.com/img/200/ia-telegrapher05nati-17-5.webp)
