RCA Transmitting Tubes 801 802 805 806 808 814 833 834 849 852 860 861 865   200 Series Transmitting Tubes 202 203 204 210 245 250 Western Electric (Some of WE's transmitting tubes which were also found in Amateur operation in addition to the commercial applications) 102D 231D 251A 252A 260A see RCA 860 271A 276A 281A 282A Eimac 25T 3C24 35T 75TH 75TL 100TH 100TL 3-200A3 250TH 250TL 304TH 304TL 3-400Z 450TH 450TL 750TL 3-1000Z 1000T 1500T 2000T