Designed to operate in radio frequency or intermediate frequency amplifiers in battery operated receivers. New old stock * No longer available for export. MFR:Standard Brand, Philco, RCA, Radio Television. SKU: 1U4
Designed for use as a combined detector, audio-frequency amplifier, and automatic-volume-control tube. New old stock * No longer available for export. MFR: Sylvania, RCA, GE, Reliatron, Westinghouse SKU: 1U5