Designed to service as a detector-audio tube in a portable piece of equipment. New old stock * No longer available for export. MFR: RCA, GE, CBS, Sylvania, Tung Sol SKU: 1S5
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
Designed for application in power output stages of receivers. New old stock * No longer available for export. MFR: GE, Ken-Rad, Tung-Sol,Teonex (Made in UK), Marconi (Made in Canada) SKU:2A5