GE 6SF5GT Vacuum Tube General Electric Glass 6SF5 Tube - Etsy
VinylSavor: The Octal Phono Preamplifier, Part 1 : Circuit
NOS Early RCA 6SF5 Radio Tube - Etsy
SM5CBW - Tubedata
6SF5 High Mu Triode Tube. Designed for service as a high gain audio-frequency amplifier and is especially useful in resistance-coupled amplifier circuits in AC or DC operated equipment. MFR: GE, Tung-Sol, Westinghouse,
RCA 6SF5 Vacuum Tube Valve NOS NIB - Etsy
Operating Points of Fi 2A3 / 3 Tube 3 Watt Direct Coupled Amplifier (Lipman) | diyAudio