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8 Miking Instruments A Few Techniques By Richard Honeycutt 16 The Nu:Tekt HA-K1 “Tube” Headphone Amplifier by Korg/NuTube Power, Psychology, and Distortion By Erik Owen Erik Owen took home the Nu:Tekt HA-K1 headphone amplifier, which is sold exclusively as a kit. After the kit was assembled, he performed a few listening tests and shares his findings. 24 Restoration and Revival of the McIntosh MC30 (Part 1) Rebuilding the MC30 By Bruce Brown This article focuses on the restoration and some improvements to the MC30 mono power amplifier. 32 A Second Life for a Vintage Tube Amplifier By Mark Driedger Just for fun, Mark Driedger decided to revamp his old Electra EL-3000. 36 Build a Budget-Friendly High-Performance Valve Headphone Amplifier By Bruce Heran Learn how to build a simple valve headphone amplifier. There are no capacitors, it is easy to configure. 40 Desktop Vacuum Tube Headphone Amplifier By Bill Reeve A vacuum-tube-based headphone amplifier that could also be used to drive small desktop speakers. 42 An Outrageous Mu Stage An Update of My 1993 Mu Stage Design By Alan Kimmel The Mu Stage is capable of producing the most constant-current operation as well as very low output impedance. Kimmel is back to divulge some of the most recent updates of his Mu Stage. 46 Experimentation Opened a Realm of Possibilities Interview with Shannon Parks, Founder of Parks Audio By Shannon Becker 52 Searching for a Unicorn (Part 1) Measuring Voltage Regulator Ripple Rejection By Brian Lowe This article examines a search for a true measurement of ripple rejection, also called power supply rejection ratio (PSRR). 58 Square-Wave Testing By Richard Honeycutt

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