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6AS7, Tube 6AS7; Röhre 6AS7 ID18665, Double Triode | Radiomuseum.org
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6AS7, Tube 6AS7; Röhre 6AS7 ID18665, Double Triode | Radiomuseum.org

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

Please help amend 6AS7PP circuit - diyAudio

6sn7 electron tube preamp line circuit diagram - Audio_Circuit

6SL7 / 6SN7 SE phono preamplifier

6AS7 PP1