Designed to be used in radio receivers that use 12v in automobiles. MFR: Sylvania, GE, Delco, RCA SKU: 12DS7 New old stock * No longer available for export.
Designed for service in high gain resistance coupled amplifiers in AC-DC operated receivers. MFR: Sylvania, RCA, GE, National Union SKU: 12SF5 New old stock * No longer available for export.
Features high transconductance with low grid-plate capacitance and a dual cathode connection to minimize effects of common cathode circuit coupling. MFR: GE, Sylvania SKU: 12SG7 New old stock * No longer available for export.