1U5

1.4V @ 0.05A Filament Drive Rail, Diode-Pentode Micro-Signal Combinational Vacuum Tube. It packages a highly sensitive single linear AM detector diode stage alongside an audio voltage pre-amplifier pentode block on a unified structure, translating analog audio modulation cleanly while shunting ambient background interference and structural microphonics. Housed in a standard 7-pin miniature glass tube footprint profile. Exact part index: 1U5.