X199

Common type USA tube/semicond. Arrow Tube Company; Springfield, MA Buck (tube brand) Champion Radio Works; Danvers, Massachusetts Continental Corp. (Continental tube brand); Chicago, IL Crescent (tubes); (where?) Croydon (where?) Duovac Radio Tube Corp.; Brooklyn, NY Hygrade Lamp Co. (Neptron); Salem, Massachusetts Hylon (tubes), brand Knight (tubes), brand Neptron Corporation; Salem MA (subs. of Hygrade Lamp Co.) Neptune Tube Works; Newark, NJ Paramount Radio Tube Co.; Brooklyn, NY Silvertone (tubes) - see also Sears; Chicago, IL Sonatron Tube Company; Chicago and New York Thorola, Winkler-Reichmann Co.; Chicago, IL Vesta; Chicago