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6sn7 electron tube preamp line circuit diagram Groovewatt a diy vacuum tube (valve) riaa phono preamplifier project 6sl7 / 6sn7 se phono preamplifier
Octal circuit mk2 preamplifier schematic vinylsavor .
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6SL7 / 6SN7 SE phono preamplifier
VinylSavor: The Octal Preamplifier Mk2: Circuit
Groovewatt a DIY Vacuum Tube (Valve) RIAA Phono Preamplifier Project