DIYClassD is the DIY branch of Hypex Electronics BV for audiophile lovers.
Building a DIY amp kit that's great for vinyl records | Opensource.com
Amazon.com: MOD 102 DIY Guitar Amplifier Kit : Musical Instruments
Op-amp | DIY-Audio-Heaven
Amazon.com: 160W+160W Amplifier Board with Treble and Bass Control, DC 12-36V, BT and AUX Inputs, 2.0 Channel Stereo AMP Board for DIY Wireless Speakers, Password Free (T160HS) : Electronics
DIY Vacuum Tube Amplifier | [protofusion]
getAudio | The Best Audio DIY Kits » getAudio
DIY Operational Amplifier
50W DIY Hi-Fi Audio Amplifier with Protection Circuitry - Gadgetronicx