Designed for service as a detector diode, AVC rectifier, and a high gain resistance coupled amplifier. MFR: Tung Sol SKU: 12Q7GT New old stock * No longer available for export.
Designed for use in video amplifiers in TV receivers. MFR: Zenith, Raytheon, Realistic, Dumont SKU: 12GN7 New old stock * No longer available for export.
General purpose medium-mu triode. It is useful for service as an oscillator or audio-frequency amplifier. MFR: RCA SKU: 12J5 New old stock * No longer available for export.