X-201A

Common type USA tube/semicond. Atlas Radio Corporation; Peabody, MA Beacon Radio Tube Corp.; Newark, NJ Bostron (tubes); (where?) Champion Radio Works; Danvers, Massachusetts Concert Master Mfg. Co. (brand) - see also Continental Corp.; Chicago, IL and Newark NJ Crescent (tubes); (where?) Croydon (where?) Diatron (tubes), Diamond Vacuum Products Co; Chicago, IL Duovac Radio Tube Corp.; Brooklyn, NY Elektron (tubes), Lectrodio Corp.; Lynn, MA Esetroc Manufacturing Co. (Cecilian); Newark, NJ Falck (only tubes), Advance Electric Co.; Los Angeles, CA - for models see under Advance Electric Federal Electric and Radio Co.; New York City, NY Fultone (tube brand) Gold Bond (tube brand) Hi-Test (tube brand) Hygrade Lamp Co. (Neptron); Salem, Massachusetts Knight (tubes), brand Milo (tube brand) Neptron Corporation; Salem MA (subs. of Hygrade Lamp Co.) OK (tubes), S.S. Kresge Co.; Detroit, MI Premier Vacuum Tube Co.; Chicago, IL Roxy; (Where ?) Sonatron Tube Company; Chicago and New York Songbird (brand) Star-Ko (Starko), USA Vesta; Chicago Wizard (tube brand); (where ?)