2B7

Common type USA tube/semicond. Genalex, BGE (brand), British General Electric Co. Pty Ltd.; Sydney, NSW. Ken-Rad - see also Amalgamated Wireless Valve Co. Murdoch's Ltd.; Sydney Osram (tubes/valves) - see British General Electrics; Sydney Canadian Marconi Co. Ltd. (CMC, Esterline), Marconi's Wireless; Montreal, QC All Wave Tube Company; Pawtucket, RI Keletron; (Where ?) Philco, Philadelphia Stg. Batt. Co.; USA Raytheon Mfg. Co.; Cambridge, MA Real Tone Tube Co.; Pawtucket, RI Roytron (tubes) - see also Triad Television & Mfg. Co.; Pawtucket, RI Sylvania (Hygrade, GTE, Nilco); Emporium (PA) Triad Television & Mfg. Co.; Pawtucket, RI