Designed to be used in automobile audio tube amplifiers where 12v power is supplied. MFR: RCA, Sylvania, Raytheon SKU: 12BW4 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.