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What commercial amplifiers used the 6AS7 power tube? | diyAudio
6AS7 Tube Single-ended Amplifier - YouTube
6AS7 PP1
6AS7 OTL headphone amplifier | diyAudio
Recording of Homemade 6AS7 Single-Ended Amplifier by Output Tube(6080
6SL7 and 6AS7 PP amplifier, design advice needed | diyAudio