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Borbely riaa preamp with tubes .
Groovewatt a DIY Vacuum Tube (Valve) RIAA Phono Preamplifier Project
New tube Phono preamp, hiss-like noise and crackling on left channel
HiFi MM RIAA Phono Stage Preamp Turntable Amplifier DIY Kit Ref EAR834
Tube Phono Pre-amp
Borbely RIAA Preamp With Tubes - A Project Remembered and Revisited