Designed to operate in a superheterodyne receiver as a triode RF amplifier and frequency converter. MFR: Tung Sol, Raytheon, GE SKU: 12FX8 New old stock * No longer available for export.
Designed to be used in AF voltage receivers where the heater and grid voltages are obtained directly from a car battery. MFR: RCA, Sylvania SKU: 12F8 New old stock * No longer available for export.