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Amp amplifier 300b lundahl interstage monoblock cfb kt66 cathode807pp cathode feedback cfb monoblock tube amplifier using lundahl 807 tube triode connectedUsing 1625 circuit.
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Higher power amps using 807's or 1625's - diyAudio
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Which Tube amplifier should I build first? - Page 2 - diyAudio
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Audio Engineering Magazine Pt 4: Schematics – Preservation Sound