Designed to operate as a high effective oscillator slope New old stock * No longer available for export. MFR: RCA, Sylvania, Mullard, GE, Tung-Sol, Westinghouse, Raytheon, Realistic SKU:1R5
Designed for output service in compact, portable, light weight equipment. New old stock * No longer available for export. MFR: Raytheon, GE, RCA, Ge, Tung Sol, SKU: 1S4
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
