Designed for use as a detector and intermediate-frequency or audio-frequency amplifier. MFR: RCA SKU: 12SF7 New old stock * No longer available for export.
Designed to be used as a radio-frequency amplifier or as a combined oscillator and mixer in VHF television receivers. It my also be used as an audio-frequency amplifier. New old stock * No longer available for export. MFR: GE, RCA SKU: 5965