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A High-Precision Tube Phono Preamp
by Fred Nachbaur     Essentially a sub-project of my "RA-100 Reference Amplifier" (see the Amplifiers section of the home-brew listings). Build a standalone phono preamp that uses innovative op-amp topology for a very precise, low-noise RIAA magnetic phono implementation. Site includes actual sound samples of the prototype.     from Fred's Vacuum (Fred Nachbaur's Vacuum Tube Projects)

A Vacuum Tube Studio Preamplifier
by Fred Nachbaur     An adaptation of my "Universal Direct-Coupled Preamplifier" circuit for use as a general-purpose studio preamp. Includes 3-band equaliser (tone controls) and voltage-follower output. All-triode design using 12AX7/ECC83 and 12AT7/ECC81.     from Fred Nachbaur's Vacuum Tube Projects

Microphone Preamp - Aikido circuit
by jsn     Microphone Preamp using John Broskie's Aikido circuit (tubecad.com).     from boozhound laboratories