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6AS7G, Tube 6AS7G; Röhre 6AS7G ID4588, Double Triode

6AS7 tube preamplifier AC input voltage modification and brief

6AS7GA OTL

6AS7 OTL headphone amplifier | diyAudio

1947 6AS7 High Quality Amplifier — Retro Vintage Modern Hi-Fi

retro-thermionic: 6AS7 SET amplifier