1T5GT

1.4V @ 0.05A Filament Drive Rail, Beam Power Amplifier Triode-Adjacent Tetrode Vacuum Tube. Engineered explicitly to serve as the high-efficiency audio power output stage in early portable electronic receivers, it translates driver currents cleanly into high-drive output vectors to run speaker lines without localized thermal value drift. Housed in a standard vintage glass tubular envelope with an octal base configuration and a protective internal layout. Exact part index: 1T5GT.