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 to function in the output stages of both AC and DC powered receivers. MFR: Zytron, RCA, Sylvania, Philco SKU: 7B5 New old stock * No longer available for export.
Designed to function as a detector amplifier or oscillator New Old Stock, New In Box * No longer available for export MFR: Motorola, Sylvania, Amperex SKU: 7C7
Designed for use as a voltage amplifier in resistance coupled cascade or phase inverter service. MFR: RCA, GE, Sylvania, Crosley SKU: 7F7 New old stock * No longer available for export.