Designed to function as a UHF oscillator in a TV amplifier MFR: Raytheon, GE, Sylvania, Tung-Sol SKU: 6T4 New old stock * No longer available for export.
Designed to function in both AC and DC powered receivers. MFR: Raytheon, Zytron, Philco, Hytron SKU: 7B4 New old stock * No longer available for export.
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